Practice paper 2 — Grade 10 Life Sciences (Easified, CAPS-aligned)
Notes
This paper lives in the app. Answer in sentences: what it is, how it works, and one worked case from the situation to the result. Draw the picture when the question is visual. Do not invent a formula.
150 min · 116 Marks · 30 questions
Learn the paper in the app: notes, a marks breakdown, the formula you need, and the board working. You do not need to download it.
Life Sciences Grade 10. Use this case. Bread, egg and cooking oil. Iodine on fresh bread goes blue-black, so the bread is mostly starch. Biuret on a piece of boiled egg white goes purple, so that is protein. Cooking oil shaken with ethanol and water turns milky, so that is fat. Heat the saliva before it touches the bread and the iodine still goes blue-black afterwards: the amylase was denatured and never broke the starch down. In sentences, say what The chemistry of life is doing here, from the situation to the result.
The chemistry of life
Notes: Pap, bread, milk and cooking oil on a South African table are the four food tests in real food.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. Bread, egg and cooking oil. Iodine on fresh bread goes blue-black, so the bread is mostly starch. Biuret on a piece of boiled egg white goes purple, so that is protein. Cooking oil shaken with ethanol and water turns milky, so that is fat. Heat the saliva before it touches the bread and the iodine still goes blue-black afterwards: the amylase was denatured and never broke the starch down. In sentences, say what The chemistry of life is doing here, from the situation to the result.
In other words — as if you have never seen this before
The chemistry of life. Water is the solvent. Carbohydrates store and supply energy. Proteins do the work, including enzymes. Lipids store energy and build membranes. Nucleic acids store the instructions. Enzymes are proteins that speed one reaction. Heat or the wrong pH changes their shape, so they stop working. Food tests name the molecule: iodine turns blue-black with starch, Biuret turns purple with protein, Benedict’s turns orange with a reducing sugar, and an ethanol emulsion shows fat.
2. What do we already know?
Pap, bread, milk and cooking oil on a South African table are the four food tests in real food.
3. Which method — and why this one?
The chemistry of life. Water is the solvent. Carbohydrates store and supply energy. Proteins do the work, including enzymes. Lipids store energy and build membranes. Nucleic acids store the instructions. Enzymes are proteins that speed one reaction. Heat or the wrong pH changes their shape, so they stop working. Food tests name the molecule: iodine turns blue-black with starch, Biuret turns purple with protein, Benedict’s turns orange with a reducing sugar, and an ethanol emulsion shows fat.
4. Step-by-step working
01 / 07
What it is
The chemistry of life is the small set of molecules every living thing is built from: water, carbohydrates, proteins, lipids and nucleic acids.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
Water is the solvent. Carbohydrates store and supply energy. Proteins do the work, including enzymes. Lipids store energy and build membranes. Nucleic acids store the instructions. Enzymes are proteins that speed one reaction. Heat or the wrong pH changes their shape, so they stop working. Food tests name the molecule: iodine turns blue-black with starch, Biuret turns purple with protein, Benedict’s turns orange with a reducing sugar, and an ethanol emulsion shows fat.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A maize porridge meal. The starch in the maize is a carbohydrate. Iodine on a scrap goes blue-black, so starch is there. The milk on the side has protein, so Biuret would go purple. Cooking does not turn starch into protein. An enzyme in saliva, amylase, starts breaking that starch into sugar, but only while it is the right shape. Boiling the saliva first would denature the enzyme and the starch would stay starch.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Living tissue is water plus carbohydrates, proteins, lipids and nucleic acids. Food tests identify them. Enzymes are proteins that fail if their shape is lost.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Living tissue is water plus carbohydrates, proteins, lipids and nucleic acids. Food tests identify them. Enzymes are proteins that fail if their shape is lost.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Living tissue is water plus carbohydrates, proteins, lipids and nucleic acids. Food tests identify them. Enzymes are proteins that fail if their shape is lost.
Copy onto your answer sheet — in this order
Answer: Living tissue is water plus carbohydrates, proteins, lipids and nucleic acids. Food tests identify them. Enzymes are proteins that fail if their shape is lost.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to call an enzyme a carbohydrate, or to think Benedict’s tests for starch. Iodine is starch. Benedict’s is reducing sugar.
2 · 4 Marks · Cells: the basic units of life
Life Sciences Grade 10. Use this case. A waterweed cell and a red blood cell. A cell from a pondweed leaf has a wall, a large vacuole and green chloroplasts, so it can photosynthesise. A mature human red blood cell has no nucleus and no chloroplasts. It carries oxygen and it cannot divide or make food. Both are cells. They are not the same kind of cell. A diagram that puts chloroplasts in the red cell, or a nucleus in the mature red cell, has mixed the two. In sentences, say what Cells: the basic units of life is doing here, from the situation to the result.
Cells: the basic units of life
Notes: Onion epidermis and a cheek scrape are the usual Grade 10 slides in a South African lab.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. A waterweed cell and a red blood cell. A cell from a pondweed leaf has a wall, a large vacuole and green chloroplasts, so it can photosynthesise. A mature human red blood cell has no nucleus and no chloroplasts. It carries oxygen and it cannot divide or make food. Both are cells. They are not the same kind of cell. A diagram that puts chloroplasts in the red cell, or a nucleus in the mature red cell, has mixed the two. In sentences, say what Cells: the basic units of life is doing here, from the situation to the result.
In other words — as if you have never seen this before
Cells: the basic units of life. The nucleus holds the DNA and controls the cell. The cell membrane decides what enters and leaves. Mitochondria release energy by cellular respiration. Ribosomes build proteins. A plant cell also has a cellulose cell wall, chloroplasts for photosynthesis, and one large vacuole that stores water and keeps the cell firm. An animal cell has no wall, no chloroplasts, and only small vacuoles.
2. What do we already know?
Onion epidermis and a cheek scrape are the usual Grade 10 slides in a South African lab.
3. Which method — and why this one?
Cells: the basic units of life. The nucleus holds the DNA and controls the cell. The cell membrane decides what enters and leaves. Mitochondria release energy by cellular respiration. Ribosomes build proteins. A plant cell also has a cellulose cell wall, chloroplasts for photosynthesis, and one large vacuole that stores water and keeps the cell firm. An animal cell has no wall, no chloroplasts, and only small vacuoles.
4. Step-by-step working
01 / 07
What it is
A cell is the smallest living unit. Plants and animals are both made of cells, but the cells are not the same.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
The nucleus holds the DNA and controls the cell. The cell membrane decides what enters and leaves. Mitochondria release energy by cellular respiration. Ribosomes build proteins. A plant cell also has a cellulose cell wall, chloroplasts for photosynthesis, and one large vacuole that stores water and keeps the cell firm. An animal cell has no wall, no chloroplasts, and only small vacuoles.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A leaf cell and a cheek cell. The leaf cell stays box-shaped because the wall holds it, and it is green because chloroplasts catch light. The cheek cell is soft-edged, has no green chloroplasts, and cannot make food from light. Both still have a nucleus and mitochondria, so both are alive and both need energy. Killing the nucleus does not leave a working cell. The membrane is the gate, not a decoration.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
Copy onto your answer sheet — in this order
Answer: Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to put chloroplasts in an animal cell, or to say the cell wall is the same thing as the cell membrane.
3 · 4 Marks · Cell division: mitosis
Life Sciences Grade 10. Use this case. Onion root tip. In a stained onion root tip, cells at the very end are in different stages at the same moment: some in prophase, some lined up, some pulling apart. A cell a centimetre higher, where the root has stopped lengthening, stays in interphase. Count 20 dividing cells and you still will not find a cell with half the chromosomes. That half-count belongs to meiosis, which a root does not do. In sentences, say what Cell division: mitosis is doing here, from the situation to the result.
Cell division: mitosis
Notes: Healing a soccer scrape, or a root tip growing longer, is mitosis in ordinary life.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. Onion root tip. In a stained onion root tip, cells at the very end are in different stages at the same moment: some in prophase, some lined up, some pulling apart. A cell a centimetre higher, where the root has stopped lengthening, stays in interphase. Count 20 dividing cells and you still will not find a cell with half the chromosomes. That half-count belongs to meiosis, which a root does not do. In sentences, say what Cell division: mitosis is doing here, from the situation to the result.
Before any working — hunt first
Given
Numbers and units already in the sentence: 10 · 20 dividing. Copy each one into a column. A name without a number is not given.
Missing
After you copy the given, the letter that still has no number is missing. The paper is pointing at: a cell with half the chromosomes. Circle that word — that is the missing variable.
Find
We are required to find: a cell with half the chromosomes. Write that as a symbol on the left, with a question mark, before you touch a formula.
Calculate
What we need to calculate: Cell division: mitosis. Then substitute the given, one line at a time, to get a cell with half the chromosomes.
In other words — as if you have never seen this before
Cell division: mitosis. Before division, in interphase, the DNA is copied. Then the nucleus divides: chromosomes become visible, line up, and the copies are pulled apart. The cell splits. Growth, repair and asexual reproduction use mitosis. The chromosome number stays the same. Mitosis does not make sperm or egg cells.
2. What do we already know?
Healing a soccer scrape, or a root tip growing longer, is mitosis in ordinary life.
3. Which method — and why this one?
Cell division: mitosis. Before division, in interphase, the DNA is copied. Then the nucleus divides: chromosomes become visible, line up, and the copies are pulled apart. The cell splits. Growth, repair and asexual reproduction use mitosis. The chromosome number stays the same. Mitosis does not make sperm or egg cells.
4. Step-by-step working
01 / 07
What it is
Mitosis is the division of a nucleus that makes two cells with the same genetic information as the parent cell.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
Before division, in interphase, the DNA is copied. Then the nucleus divides: chromosomes become visible, line up, and the copies are pulled apart. The cell splits. Growth, repair and asexual reproduction use mitosis. The chromosome number stays the same. Mitosis does not make sperm or egg cells.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A cut on a hand. The skin cells at the edge copy their DNA, then each nucleus divides by mitosis. The two daughter cells have the same chromosomes as the skin cell they came from. That is why the new skin matches the old skin. If the copies were shuffled into half the chromosomes, the repair would not be skin. That halving is meiosis, and it is not what a healing cut does.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Mitosis copies a cell for growth and repair. The chromosome number does not change. It is not how gametes are made.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Mitosis copies a cell for growth and repair. The chromosome number does not change. It is not how gametes are made.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Mitosis copies a cell for growth and repair. The chromosome number does not change. It is not how gametes are made.
Copy onto your answer sheet — in this order
Answer: Mitosis copies a cell for growth and repair. The chromosome number does not change. It is not how gametes are made.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to use mitosis and meiosis as the same word. Mitosis keeps the number. Meiosis halves it.
4 · 4 Marks · Support and transport in plants
Life Sciences Grade 10. Use this case. Strings in a celery stalk. The strings that catch in your teeth in a celery stalk are strengthening and transport tissue. They hold the stalk up and move water. The pale crisp flesh around them is parenchyma, a packing tissue. Both are in one organ. Chewing the strings does not mean the flesh is the same tissue. A tissue is one job. The stalk is several jobs held together. In sentences, say what Plant and animal tissues is doing here, from the situation to the result.
Support and transport in plants
Notes: A slice of spinach stem and a smear of cheek cells show two tissues side by side.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. Strings in a celery stalk. The strings that catch in your teeth in a celery stalk are strengthening and transport tissue. They hold the stalk up and move water. The pale crisp flesh around them is parenchyma, a packing tissue. Both are in one organ. Chewing the strings does not mean the flesh is the same tissue. A tissue is one job. The stalk is several jobs held together. In sentences, say what Plant and animal tissues is doing here, from the situation to the result.
In other words — as if you have never seen this before
Plant and animal tissues. Animal tissues: epithelial tissue covers and lines, connective tissue supports and transports (blood, bone, cartilage), muscle tissue contracts, nerve tissue carries impulses. Plant tissues: epidermis protects, parenchyma stores and photosynthesises, collenchyma and sclerenchyma support, xylem moves water, phloem moves sugars.
2. What do we already know?
A slice of spinach stem and a smear of cheek cells show two tissues side by side.
3. Which method — and why this one?
Plant and animal tissues. Animal tissues: epithelial tissue covers and lines, connective tissue supports and transports (blood, bone, cartilage), muscle tissue contracts, nerve tissue carries impulses. Plant tissues: epidermis protects, parenchyma stores and photosynthesises, collenchyma and sclerenchyma support, xylem moves water, phloem moves sugars.
4. Step-by-step working
01 / 07
What it is
A tissue is a group of cells with the same structure, doing the same job.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
Animal tissues: epithelial tissue covers and lines, connective tissue supports and transports (blood, bone, cartilage), muscle tissue contracts, nerve tissue carries impulses. Plant tissues: epidermis protects, parenchyma stores and photosynthesises, collenchyma and sclerenchyma support, xylem moves water, phloem moves sugars.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. The lining of the mouth and the skin of a leaf. Mouth lining is epithelial tissue: thin cells packed as a sheet, good at covering, poor at lifting a load. The strings in a spinach stem that are hard to chew are strengthening tissue, not the green flesh. The green flesh is parenchyma, the tissue that holds chloroplasts. Blood is a tissue even though it is liquid, because its cells share the job of transport. A single cell is not yet a tissue.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Tissue means similar cells, one job. Animals rely on epithelial, connective, muscle and nerve tissue. Plants rely on covering, packing, strengthening and transport tissue.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Tissue means similar cells, one job. Animals rely on epithelial, connective, muscle and nerve tissue. Plants rely on covering, packing, strengthening and transport tissue.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Tissue means similar cells, one job. Animals rely on epithelial, connective, muscle and nerve tissue. Plants rely on covering, packing, strengthening and transport tissue.
Copy onto your answer sheet — in this order
Answer: Tissue means similar cells, one job. Animals rely on epithelial, connective, muscle and nerve tissue. Plants rely on covering, packing, strengthening and transport tissue.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to call an organ, such as the heart, a tissue. The heart is an organ made of several tissues.
5 · 4 Marks · Plant organs: leaf, stem, root
Life Sciences Grade 10. Use this case. Bean on wet cotton wool. A bean left on wet cotton wool splits and a white root grows down, with a fuzzy band of root hairs a few millimetres behind the tip. Those hairs are the organ’s absorbing surface. The shoot that follows grows up and opens leaves. Cover the leaves with petroleum jelly and the plant yellows, because the leaf can no longer take in carbon dioxide. The root hairs in the wet wool are still fine. The failed organ is the leaf. In sentences, say what Plant organs: leaf, stem, root is doing here, from the situation to the result.
Plant organs: leaf, stem, root
Notes: A bean plant in a cooldrink bottle is enough to see leaf, stem and root as three organs.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. Bean on wet cotton wool. A bean left on wet cotton wool splits and a white root grows down, with a fuzzy band of root hairs a few millimetres behind the tip. Those hairs are the organ’s absorbing surface. The shoot that follows grows up and opens leaves. Cover the leaves with petroleum jelly and the plant yellows, because the leaf can no longer take in carbon dioxide. The root hairs in the wet wool are still fine. The failed organ is the leaf. In sentences, say what Plant organs: leaf, stem, root is doing here, from the situation to the result.
In other words — as if you have never seen this before
Plant organs: leaf, stem, root. The leaf is built to photosynthesise: a waxy cuticle, epidermis, palisade cells packed with chloroplasts, spongy cells with air spaces, and stomata that open for carbon dioxide and close to save water. The stem holds the plant up and carries xylem and phloem in vascular bundles. The root anchors the plant, grows hairs for a large surface, and takes up water and mineral salts. A flower is a reproductive organ, not a leaf.
2. What do we already know?
A bean plant in a cooldrink bottle is enough to see leaf, stem and root as three organs.
3. Which method — and why this one?
Plant organs: leaf, stem, root. The leaf is built to photosynthesise: a waxy cuticle, epidermis, palisade cells packed with chloroplasts, spongy cells with air spaces, and stomata that open for carbon dioxide and close to save water. The stem holds the plant up and carries xylem and phloem in vascular bundles. The root anchors the plant, grows hairs for a large surface, and takes up water and mineral salts. A flower is a reproductive organ, not a leaf.
4. Step-by-step working
01 / 07
What it is
An organ is several tissues working as one part. In a plant the leaf, stem and root are the organs you must be able to read.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
The leaf is built to photosynthesise: a waxy cuticle, epidermis, palisade cells packed with chloroplasts, spongy cells with air spaces, and stomata that open for carbon dioxide and close to save water. The stem holds the plant up and carries xylem and phloem in vascular bundles. The root anchors the plant, grows hairs for a large surface, and takes up water and mineral salts. A flower is a reproductive organ, not a leaf.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A tomato plant on a windowsill. The leaf faces the light so palisade cells can catch it. Stomata on the underside let carbon dioxide in. If those stomata stayed shut all day, photosynthesis would slow because carbon dioxide could not enter. The stem’s bundles move water up from the root and sugars down from the leaf. The root hairs, not the green leaf, are what meet the wet soil. Paint the leaf and you have not explained it. The explanation is what each tissue is for.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Leaf makes food, stem supports and transports, root anchors and absorbs. Each organ is tissues arranged for that job.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Leaf makes food, stem supports and transports, root anchors and absorbs. Each organ is tissues arranged for that job.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Leaf makes food, stem supports and transports, root anchors and absorbs. Each organ is tissues arranged for that job.
Copy onto your answer sheet — in this order
Answer: Leaf makes food, stem supports and transports, root anchors and absorbs. Each organ is tissues arranged for that job.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to say roots photosynthesise, or that stomata are for taking up soil water.
6 · 8 Marks · Support and transport in plants
Life Sciences Grade 10. Use this case. Spinach that droops at noon. A spinach plant in a pot droops at noon because the vacuoles have lost water and no longer push on the walls. Water it, and by evening the leaves stand up. The xylem was not cut. The phloem was not cut. Turgor came back. A plant that stays limp after a thorough watering has a different problem. This one was a pressure problem, and the recovery shows it. In sentences, say what Support and transport in plants is doing here, from the situation to the result.
Support and transport in plants
Notes: A wilted mielie seedling after a hot Free State afternoon, recovering at night, is turgor and xylem in one story.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. Spinach that droops at noon. A spinach plant in a pot droops at noon because the vacuoles have lost water and no longer push on the walls. Water it, and by evening the leaves stand up. The xylem was not cut. The phloem was not cut. Turgor came back. A plant that stays limp after a thorough watering has a different problem. This one was a pressure problem, and the recovery shows it. In sentences, say what Support and transport in plants is doing here, from the situation to the result.
In other words — as if you have never seen this before
Support and transport in plants. A full vacuole pushes the cytoplasm against a firm cell wall. That turgor is what keeps a soft stem upright. Xylem vessels are dead tubes stiffened with lignin. They carry water and salts from root to leaf. Phloem sieve tubes are living. They carry sugars from leaves to roots, fruits and growing tips, in either direction as the plant needs. Transpiration, the loss of water vapour from leaves, pulls more water up the xylem.
2. What do we already know?
A wilted mielie seedling after a hot Free State afternoon, recovering at night, is turgor and xylem in one story.
3. Which method — and why this one?
Support and transport in plants. A full vacuole pushes the cytoplasm against a firm cell wall. That turgor is what keeps a soft stem upright. Xylem vessels are dead tubes stiffened with lignin. They carry water and salts from root to leaf. Phloem sieve tubes are living. They carry sugars from leaves to roots, fruits and growing tips, in either direction as the plant needs. Transpiration, the loss of water vapour from leaves, pulls more water up the xylem.
4. Step-by-step working
01 / 07
What it is
Plants stand up and move materials with turgor pressure and with two transport tissues, xylem and phloem.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
A full vacuole pushes the cytoplasm against a firm cell wall. That turgor is what keeps a soft stem upright. Xylem vessels are dead tubes stiffened with lignin. They carry water and salts from root to leaf. Phloem sieve tubes are living. They carry sugars from leaves to roots, fruits and growing tips, in either direction as the plant needs. Transpiration, the loss of water vapour from leaves, pulls more water up the xylem.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A spinach bunch left on the counter versus one in a jar of water. Out of water the vacuoles shrink, turgor falls, and the leaves wilt. In water the xylem refills, vacuoles firm up, and the bunch stands. The sugars made in the leaves do not travel in that same water pipe. They travel in the phloem. Block the phloem, as a ring of bark cut from a tree does, and sugars pile up above the cut while water can still rise in the deeper xylem.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Turgor holds soft parts up. Xylem moves water up. Phloem moves sugars. Transpiration is the pull.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Turgor holds soft parts up. Xylem moves water up. Phloem moves sugars. Transpiration is the pull.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Turgor holds soft parts up. Xylem moves water up. Phloem moves sugars. Transpiration is the pull.
Copy onto your answer sheet — in this order
Answer: Turgor holds soft parts up. Xylem moves water up. Phloem moves sugars. Transpiration is the pull.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to send sugars up the xylem, or to say xylem cells are alive and full of chloroplasts.
7 · 4 Marks · Support systems in animals
Life Sciences Grade 10. Use this case. A soccer kick. The hip is a ball-and-socket, so the thigh can swing in several directions. The knee is a hinge, so the lower leg only folds and straightens. To straighten the knee for the kick, the quadriceps pulls. The hamstrings let go. After the kick the hamstrings pull and the knee bends again. The quadriceps cannot push the knee straight. No muscle pushes. In sentences, say what Support systems in animals is doing here, from the situation to the result.
Support systems in animals
Notes: A netballer’s knee hinge and shoulder socket are the two joints in one game.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. A soccer kick. The hip is a ball-and-socket, so the thigh can swing in several directions. The knee is a hinge, so the lower leg only folds and straightens. To straighten the knee for the kick, the quadriceps pulls. The hamstrings let go. After the kick the hamstrings pull and the knee bends again. The quadriceps cannot push the knee straight. No muscle pushes. In sentences, say what Support systems in animals is doing here, from the situation to the result.
In other words — as if you have never seen this before
Support systems in animals. Bone is living tissue with calcium salts for hardness. Joints are where bones meet: a hinge, like the knee, bends one way; a ball-and-socket, like the shoulder, turns in many directions. Cartilage cushions. Ligaments hold bone to bone. Tendons hold muscle to bone. Muscles only pull. A pair of muscles works against each other so a limb can bend and straighten.
2. What do we already know?
A netballer’s knee hinge and shoulder socket are the two joints in one game.
3. Which method — and why this one?
Support systems in animals. Bone is living tissue with calcium salts for hardness. Joints are where bones meet: a hinge, like the knee, bends one way; a ball-and-socket, like the shoulder, turns in many directions. Cartilage cushions. Ligaments hold bone to bone. Tendons hold muscle to bone. Muscles only pull. A pair of muscles works against each other so a limb can bend and straighten.
4. Step-by-step working
01 / 07
What it is
The human skeleton supports the body, protects organs, lets muscles move the bones, stores minerals and makes blood cells.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
Bone is living tissue with calcium salts for hardness. Joints are where bones meet: a hinge, like the knee, bends one way; a ball-and-socket, like the shoulder, turns in many directions. Cartilage cushions. Ligaments hold bone to bone. Tendons hold muscle to bone. Muscles only pull. A pair of muscles works against each other so a limb can bend and straighten.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. Bending the elbow. The biceps contracts and pulls the forearm up. The triceps is relaxed. To straighten the arm the triceps pulls and the biceps lets go. The elbow is a hinge, so the forearm does not spin like a shoulder. The skull is not a joint for movement. It is a case that protects the brain. A broken bone can heal because bone is living tissue, not dry plastic.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Skeleton means support, protection, movement, minerals and blood cells. Muscles pull in pairs. Joint type limits the movement.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Skeleton means support, protection, movement, minerals and blood cells. Muscles pull in pairs. Joint type limits the movement.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Skeleton means support, protection, movement, minerals and blood cells. Muscles pull in pairs. Joint type limits the movement.
Copy onto your answer sheet — in this order
Answer: Skeleton means support, protection, movement, minerals and blood cells. Muscles pull in pairs. Joint type limits the movement.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to say muscles push, or that ligaments and tendons are the same strap.
8 · 4 Marks · Transport systems in mammals
Life Sciences Grade 10. Use this case. A coronary artery. The coronary arteries leave the aorta and feed the heart muscle itself. They are arteries, so the blood in them has just come from the lungs and is oxygen-rich. If one of them is blocked, that patch of muscle is starved even though the chambers are full of blood. The blood inside the chambers is not what feeds the wall. The wall has its own supply. That is why a blockage there is a heart attack, not a cut on the skin. In sentences, say what Transport systems in mammals is doing here, from the situation to the result.
Transport systems in mammals
Notes: The pulse at the wrist is an artery. The vessel a nurse draws blood from in the arm is a vein.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. A coronary artery. The coronary arteries leave the aorta and feed the heart muscle itself. They are arteries, so the blood in them has just come from the lungs and is oxygen-rich. If one of them is blocked, that patch of muscle is starved even though the chambers are full of blood. The blood inside the chambers is not what feeds the wall. The wall has its own supply. That is why a blockage there is a heart attack, not a cut on the skin. In sentences, say what Transport systems in mammals is doing here, from the situation to the result.
In other words — as if you have never seen this before
Transport systems in mammals. The right side of the heart sends blood to the lungs. The left side sends blood to the body. Arteries carry blood away from the heart under high pressure, with thick walls. Veins carry blood back, with thinner walls and valves so it does not fall back. Capillaries are one cell thick, so oxygen, carbon dioxide and food can diffuse. Valves in the heart keep the flow one way. The wall of the left ventricle is thickest because it must push blood through the whole body.
2. What do we already know?
The pulse at the wrist is an artery. The vessel a nurse draws blood from in the arm is a vein.
3. Which method — and why this one?
Transport systems in mammals. The right side of the heart sends blood to the lungs. The left side sends blood to the body. Arteries carry blood away from the heart under high pressure, with thick walls. Veins carry blood back, with thinner walls and valves so it does not fall back. Capillaries are one cell thick, so oxygen, carbon dioxide and food can diffuse. Valves in the heart keep the flow one way. The wall of the left ventricle is thickest because it must push blood through the whole body.
4. Step-by-step working
01 / 07
What it is
Mammals move oxygen, food and wastes in blood, pushed by a four-chambered heart through a double circulation.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
The right side of the heart sends blood to the lungs. The left side sends blood to the body. Arteries carry blood away from the heart under high pressure, with thick walls. Veins carry blood back, with thinner walls and valves so it does not fall back. Capillaries are one cell thick, so oxygen, carbon dioxide and food can diffuse. Valves in the heart keep the flow one way. The wall of the left ventricle is thickest because it must push blood through the whole body.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A learner runs to the taxi rank. Leg muscles need more oxygen. The left ventricle pushes oxygen-rich blood into the aorta and out through arteries. At the muscle capillaries, oxygen leaves and carbon dioxide enters. Veins bring that darker blood back to the right atrium, the right ventricle sends it to the lungs, and only then does it return to the left side. If a vein had no valves in the leg, blood would pool. If someone calls every red vessel an artery, they have skipped the rule: artery means away from the heart, not “the red one”.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Double circulation: heart to lungs, heart to body. Arteries away, veins back, capillaries exchange. Left ventricle is the strongest pump.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Double circulation: heart to lungs, heart to body. Arteries away, veins back, capillaries exchange. Left ventricle is the strongest pump.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Double circulation: heart to lungs, heart to body. Arteries away, veins back, capillaries exchange. Left ventricle is the strongest pump.
Copy onto your answer sheet — in this order
Answer: Double circulation: heart to lungs, heart to body. Arteries away, veins back, capillaries exchange. Left ventricle is the strongest pump.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to say arteries always carry oxygenated blood. The pulmonary artery carries oxygen-poor blood to the lungs.
9 · 4 Marks · Biosphere to ecosystems
Life Sciences Grade 10. Use this case. Numbers on a Kruger food chain. Give the grass 10 000 kJ from the sun. Impala that eat it keep about 1 000 kJ. A lion that eats impala keeps about 100 kJ. That is why one pride needs a huge patch of grass and why you never see more lions than impala. Vultures and dung beetles are not a fourth floor of the same size. They feed on what is left, and without them the 10 000 kJ stays locked in dead bodies. In sentences, say what Biosphere to ecosystems is doing here, from the situation to the result.
Biosphere to ecosystems
Notes: Grassland, savanna, fynbos and Nama Karoo are the biomes a South African map is asking you to picture.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. Numbers on a Kruger food chain. Give the grass 10 000 kJ from the sun. Impala that eat it keep about 1 000 kJ. A lion that eats impala keeps about 100 kJ. That is why one pride needs a huge patch of grass and why you never see more lions than impala. Vultures and dung beetles are not a fourth floor of the same size. They feed on what is left, and without them the 10 000 kJ stays locked in dead bodies. In sentences, say what Biosphere to ecosystems is doing here, from the situation to the result.
Before any working — hunt first
Given
Numbers and units already in the sentence: 10 · 10 · 000 kJ · 1 · 000 kJ · 100 kJ · 10 · 000 kJ. Copy each one into a column. A name without a number is not given.
Missing
After you copy the given, the letter that still has no number is missing. The paper is pointing at: grass 10 000 kJ from the sun. Circle that word — that is the missing variable.
Find
We are required to find: grass 10 000 kJ from the sun. Write that as a symbol on the left, with a question mark, before you touch a formula.
Calculate
What we need to calculate: Biosphere to ecosystems. Then substitute the given, one line at a time, to get grass 10 000 kJ from the sun.
In other words — as if you have never seen this before
Biosphere to ecosystems. The biosphere is every place life exists. A biome is a large climate region, such as grassland or fynbos. An ecosystem is the living community plus the non-living soil, water and climate. A population is one species in one place. A community is all the populations together. Producers make food. Consumers eat. Decomposers return nutrients. In a food chain, only about a tenth of the energy passes to the next level, so pyramids of energy narrow upwards.
2. What do we already know?
Grassland, savanna, fynbos and Nama Karoo are the biomes a South African map is asking you to picture.
3. Which method — and why this one?
Biosphere to ecosystems. The biosphere is every place life exists. A biome is a large climate region, such as grassland or fynbos. An ecosystem is the living community plus the non-living soil, water and climate. A population is one species in one place. A community is all the populations together. Producers make food. Consumers eat. Decomposers return nutrients. In a food chain, only about a tenth of the energy passes to the next level, so pyramids of energy narrow upwards.
4. Step-by-step working
01 / 07
What it is
Life is organised from the whole living layer of Earth down to one organism, and energy moves through that organisation in food chains.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
The biosphere is every place life exists. A biome is a large climate region, such as grassland or fynbos. An ecosystem is the living community plus the non-living soil, water and climate. A population is one species in one place. A community is all the populations together. Producers make food. Consumers eat. Decomposers return nutrients. In a food chain, only about a tenth of the energy passes to the next level, so pyramids of energy narrow upwards.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A Highveld grassland after rain. Grass is the producer. A locust eats grass. A bird eats locusts. Energy entered as sunlight and was trapped by the grass. Most of that energy was used by the grass itself, so the bird receives only a scrap of the original light. There cannot be more hawks than grass. Fynbos in the Cape is a different biome, not a different definition of ecosystem. Remove the decomposers and nutrients stay locked in dead leaves, so the grass eventually fails.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Biosphere, biome, ecosystem, community, population, organism. Energy enters from the sun and thins at each step of the food chain.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Biosphere, biome, ecosystem, community, population, organism. Energy enters from the sun and thins at each step of the food chain.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Biosphere, biome, ecosystem, community, population, organism. Energy enters from the sun and thins at each step of the food chain.
Copy onto your answer sheet — in this order
Answer: Biosphere, biome, ecosystem, community, population, organism. Energy enters from the sun and thins at each step of the food chain.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to draw a pyramid of energy with the top wider than the producers, or to call a herd of springbok a community.
10 · 4 Marks · Biodiversity and classification
Life Sciences Grade 10. Use this case. Homo sapiens and a virus. A human is Homo sapiens: genus Homo, species sapiens. Two people from different countries are the same species. A virus that gives one of them flu is not in any of the five kingdoms, because it is not a cell. It has no metabolism of its own. Calling it a very small bacterium puts it in a kingdom it does not belong to. The rank has to follow the structure, not the fact that it makes you ill. In sentences, say what Biodiversity and classification is doing here, from the situation to the result.
Biodiversity and classification
Notes: Aloes, fynbos proteas and invasive wattles are the local picture of indigenous versus alien.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. Homo sapiens and a virus. A human is Homo sapiens: genus Homo, species sapiens. Two people from different countries are the same species. A virus that gives one of them flu is not in any of the five kingdoms, because it is not a cell. It has no metabolism of its own. Calling it a very small bacterium puts it in a kingdom it does not belong to. The rank has to follow the structure, not the fact that it makes you ill. In sentences, say what Biodiversity and classification is doing here, from the situation to the result.
In other words — as if you have never seen this before
Biodiversity and classification. The ranks run from large to small: kingdom, phylum, class, order, family, genus, species. A species is a group that can interbreed and produce fertile young. Scientific names have two words, genus then species, written so the genus starts with a capital. The five kingdoms you meet are bacteria, protists, fungi, plants and animals. A virus is not in those kingdoms. It is not a cell.
2. What do we already know?
Aloes, fynbos proteas and invasive wattles are the local picture of indigenous versus alien.
3. Which method — and why this one?
Biodiversity and classification. The ranks run from large to small: kingdom, phylum, class, order, family, genus, species. A species is a group that can interbreed and produce fertile young. Scientific names have two words, genus then species, written so the genus starts with a capital. The five kingdoms you meet are bacteria, protists, fungi, plants and animals. A virus is not in those kingdoms. It is not a cell.
4. Step-by-step working
01 / 07
What it is
Biodiversity is the variety of life. Classification is how we organise that variety so a name means the same organism everywhere.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
The ranks run from large to small: kingdom, phylum, class, order, family, genus, species. A species is a group that can interbreed and produce fertile young. Scientific names have two words, genus then species, written so the genus starts with a capital. The five kingdoms you meet are bacteria, protists, fungi, plants and animals. A virus is not in those kingdoms. It is not a cell.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. Two beetles that look similar in a garden. If they cannot produce fertile offspring together, they are not one species, even if the colour matches. Their names would differ in the second word. A mushroom is a fungus, not a plant: it does not photosynthesise. An aloe is a plant. Grouping the aloe with the mushroom because both “sit still” ignores how they feed. Indigenous species evolved here. An alien species was brought in and can crowd local ones out.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Classification narrows from kingdom to species. A scientific name is genus plus species. Feeding and cell type decide the kingdom, not just the shape.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Classification narrows from kingdom to species. A scientific name is genus plus species. Feeding and cell type decide the kingdom, not just the shape.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Classification narrows from kingdom to species. A scientific name is genus plus species. Feeding and cell type decide the kingdom, not just the shape.
Copy onto your answer sheet — in this order
Answer: Classification narrows from kingdom to species. A scientific name is genus plus species. Feeding and cell type decide the kingdom, not just the shape.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to place viruses in the kingdom of bacteria, or to treat the common name “lily” as a scientific name.
11 · 4 Marks · Support systems in animals
Life Sciences Grade 10. Use this case. A Karoo fossil and Mrs Ples. A therapsid skull in a Karoo rock layer is hundreds of millions of years older than Mrs Ples at Sterkfontein. The Karoo fossil sits in a deeper, older story of reptiles that are not dinosaurs and not humans. Mrs Ples is a late fossil, a hominin, already walking upright. Putting them in one “age of fossils” erases the order. The layer and the date are the theory. In sentences, say what History of life on Earth is doing here, from the situation to the result.
Support systems in animals
Notes: Karoo fossils and the Cradle of Humankind are the two South African places this story stands on.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. A Karoo fossil and Mrs Ples. A therapsid skull in a Karoo rock layer is hundreds of millions of years older than Mrs Ples at Sterkfontein. The Karoo fossil sits in a deeper, older story of reptiles that are not dinosaurs and not humans. Mrs Ples is a late fossil, a hominin, already walking upright. Putting them in one “age of fossils” erases the order. The layer and the date are the theory. In sentences, say what History of life on Earth is doing here, from the situation to the result.
In other words — as if you have never seen this before
History of life on Earth. Fossils are preserved remains or traces. In undisturbed rock, deeper layers are older. Over hundreds of millions of years, life changed: simple cells, then animals in the seas, then plants and animals on land, then later the groups we know. Mass extinctions cut that history. Continental drift moved the landmasses the fossils sit on. Humans appear very late in that timeline.
2. What do we already know?
Karoo fossils and the Cradle of Humankind are the two South African places this story stands on.
3. Which method — and why this one?
History of life on Earth. Fossils are preserved remains or traces. In undisturbed rock, deeper layers are older. Over hundreds of millions of years, life changed: simple cells, then animals in the seas, then plants and animals on land, then later the groups we know. Mass extinctions cut that history. Continental drift moved the landmasses the fossils sit on. Humans appear very late in that timeline.
4. Step-by-step working
01 / 07
What it is
Life on Earth has a history that is read from rocks, fossils and the order of the layers they sit in.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
Fossils are preserved remains or traces. In undisturbed rock, deeper layers are older. Over hundreds of millions of years, life changed: simple cells, then animals in the seas, then plants and animals on land, then later the groups we know. Mass extinctions cut that history. Continental drift moved the landmasses the fossils sit on. Humans appear very late in that timeline.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A quarry face in the Karoo. A fossil reptile in a lower layer cannot be younger than a fossil in the layer above it, unless the rocks have been overturned. The fossil is evidence that an animal with that body once lived there, not a drawing someone buried. If the same kind of fossil turns up in South America and in Africa, one explanation is that those continents were once joined. The theory is the timeline plus the evidence, not a list of names to memorise with no order.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Fossils in rock order are the evidence for the history of life. Deeper usually means older. Life changed over a very long time.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Fossils in rock order are the evidence for the history of life. Deeper usually means older. Life changed over a very long time.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Fossils in rock order are the evidence for the history of life. Deeper usually means older. Life changed over a very long time.
Copy onto your answer sheet — in this order
Answer: Fossils in rock order are the evidence for the history of life. Deeper usually means older. Life changed over a very long time.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to put humans near the start of the timeline, or to treat a fossil as a living relative you could meet.
12 · 8 Marks · The chemistry of life
Life Sciences Grade 10. Use this case. Apple juice and a boiled egg white. Iodine on apple juice stays brown, so the juice is not starch. Benedict’s, heated with the same juice, turns orange, so a reducing sugar is there. Biuret on a boiled egg white goes purple, and Benedict’s on that egg white does not turn orange. Boiling the egg white did not turn the protein into sugar. It only changed the shape. The test names the molecule. The colour is not a decoration. In sentences, say what The chemistry of life is doing here, from the situation to the result.
The chemistry of life
Notes: Pap, bread, milk and cooking oil on a South African table are the four food tests in real food.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. Apple juice and a boiled egg white. Iodine on apple juice stays brown, so the juice is not starch. Benedict’s, heated with the same juice, turns orange, so a reducing sugar is there. Biuret on a boiled egg white goes purple, and Benedict’s on that egg white does not turn orange. Boiling the egg white did not turn the protein into sugar. It only changed the shape. The test names the molecule. The colour is not a decoration. In sentences, say what The chemistry of life is doing here, from the situation to the result.
In other words — as if you have never seen this before
The chemistry of life. Water is the solvent. Carbohydrates store and supply energy. Proteins do the work, including enzymes. Lipids store energy and build membranes. Nucleic acids store the instructions. Enzymes are proteins that speed one reaction. Heat or the wrong pH changes their shape, so they stop working. Food tests name the molecule: iodine turns blue-black with starch, Biuret turns purple with protein, Benedict’s turns orange with a reducing sugar, and an ethanol emulsion shows fat.
2. What do we already know?
Pap, bread, milk and cooking oil on a South African table are the four food tests in real food.
3. Which method — and why this one?
The chemistry of life. Water is the solvent. Carbohydrates store and supply energy. Proteins do the work, including enzymes. Lipids store energy and build membranes. Nucleic acids store the instructions. Enzymes are proteins that speed one reaction. Heat or the wrong pH changes their shape, so they stop working. Food tests name the molecule: iodine turns blue-black with starch, Biuret turns purple with protein, Benedict’s turns orange with a reducing sugar, and an ethanol emulsion shows fat.
4. Step-by-step working
01 / 07
What it is
The chemistry of life is the small set of molecules every living thing is built from: water, carbohydrates, proteins, lipids and nucleic acids.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
Water is the solvent. Carbohydrates store and supply energy. Proteins do the work, including enzymes. Lipids store energy and build membranes. Nucleic acids store the instructions. Enzymes are proteins that speed one reaction. Heat or the wrong pH changes their shape, so they stop working. Food tests name the molecule: iodine turns blue-black with starch, Biuret turns purple with protein, Benedict’s turns orange with a reducing sugar, and an ethanol emulsion shows fat.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A maize porridge meal. The starch in the maize is a carbohydrate. Iodine on a scrap goes blue-black, so starch is there. The milk on the side has protein, so Biuret would go purple. Cooking does not turn starch into protein. An enzyme in saliva, amylase, starts breaking that starch into sugar, but only while it is the right shape. Boiling the saliva first would denature the enzyme and the starch would stay starch.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Living tissue is water plus carbohydrates, proteins, lipids and nucleic acids. Food tests identify them. Enzymes are proteins that fail if their shape is lost.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Living tissue is water plus carbohydrates, proteins, lipids and nucleic acids. Food tests identify them. Enzymes are proteins that fail if their shape is lost.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Living tissue is water plus carbohydrates, proteins, lipids and nucleic acids. Food tests identify them. Enzymes are proteins that fail if their shape is lost.
Copy onto your answer sheet — in this order
Answer: Living tissue is water plus carbohydrates, proteins, lipids and nucleic acids. Food tests identify them. Enzymes are proteins that fail if their shape is lost.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to call an enzyme a carbohydrate, or to think Benedict’s tests for starch. Iodine is starch. Benedict’s is reducing sugar.
13 · 4 Marks · Cells: the basic units of life
Life Sciences Grade 10. Use this case. Potato cell and muscle cell. A cell from a potato has a wall and stores starch, but it has no chloroplasts, because a potato grows underground and does not catch light. A cell from thigh muscle has no wall and is packed with mitochondria, because the muscle needs ATP to contract. Both have a nucleus and a membrane. The potato cell cannot contract. The muscle cell cannot hold a square shape. In sentences, say what Cells: the basic units of life is doing here, from the situation to the result.
Cells: the basic units of life
Notes: Onion epidermis and a cheek scrape are the usual Grade 10 slides in a South African lab.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. Potato cell and muscle cell. A cell from a potato has a wall and stores starch, but it has no chloroplasts, because a potato grows underground and does not catch light. A cell from thigh muscle has no wall and is packed with mitochondria, because the muscle needs ATP to contract. Both have a nucleus and a membrane. The potato cell cannot contract. The muscle cell cannot hold a square shape. In sentences, say what Cells: the basic units of life is doing here, from the situation to the result.
In other words — as if you have never seen this before
Cells: the basic units of life. The nucleus holds the DNA and controls the cell. The cell membrane decides what enters and leaves. Mitochondria release energy by cellular respiration. Ribosomes build proteins. A plant cell also has a cellulose cell wall, chloroplasts for photosynthesis, and one large vacuole that stores water and keeps the cell firm. An animal cell has no wall, no chloroplasts, and only small vacuoles.
2. What do we already know?
Onion epidermis and a cheek scrape are the usual Grade 10 slides in a South African lab.
3. Which method — and why this one?
Cells: the basic units of life. The nucleus holds the DNA and controls the cell. The cell membrane decides what enters and leaves. Mitochondria release energy by cellular respiration. Ribosomes build proteins. A plant cell also has a cellulose cell wall, chloroplasts for photosynthesis, and one large vacuole that stores water and keeps the cell firm. An animal cell has no wall, no chloroplasts, and only small vacuoles.
4. Step-by-step working
01 / 07
What it is
A cell is the smallest living unit. Plants and animals are both made of cells, but the cells are not the same.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
The nucleus holds the DNA and controls the cell. The cell membrane decides what enters and leaves. Mitochondria release energy by cellular respiration. Ribosomes build proteins. A plant cell also has a cellulose cell wall, chloroplasts for photosynthesis, and one large vacuole that stores water and keeps the cell firm. An animal cell has no wall, no chloroplasts, and only small vacuoles.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A leaf cell and a cheek cell. The leaf cell stays box-shaped because the wall holds it, and it is green because chloroplasts catch light. The cheek cell is soft-edged, has no green chloroplasts, and cannot make food from light. Both still have a nucleus and mitochondria, so both are alive and both need energy. Killing the nucleus does not leave a working cell. The membrane is the gate, not a decoration.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
Copy onto your answer sheet — in this order
Answer: Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to put chloroplasts in an animal cell, or to say the cell wall is the same thing as the cell membrane.
14 · 4 Marks · Cell division: mitosis
Life Sciences Grade 10. Use this case. Skin closing over a cut. A cut on a shin closes because skin cells copy their DNA and divide. Each new cell keeps the same chromosome number as the skin cell it came from. That is why the new skin is still that person’s skin. If the repair halved the chromosomes, the patch would not be body cells. Halving is meiosis, and a healing shin does not do it. The scab is not the division. The division is under it. In sentences, say what Cell division: mitosis is doing here, from the situation to the result.
Cell division: mitosis
Notes: Healing a soccer scrape, or a root tip growing longer, is mitosis in ordinary life.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. Skin closing over a cut. A cut on a shin closes because skin cells copy their DNA and divide. Each new cell keeps the same chromosome number as the skin cell it came from. That is why the new skin is still that person’s skin. If the repair halved the chromosomes, the patch would not be body cells. Halving is meiosis, and a healing shin does not do it. The scab is not the division. The division is under it. In sentences, say what Cell division: mitosis is doing here, from the situation to the result.
In other words — as if you have never seen this before
Cell division: mitosis. Before division, in interphase, the DNA is copied. Then the nucleus divides: chromosomes become visible, line up, and the copies are pulled apart. The cell splits. Growth, repair and asexual reproduction use mitosis. The chromosome number stays the same. Mitosis does not make sperm or egg cells.
2. What do we already know?
Healing a soccer scrape, or a root tip growing longer, is mitosis in ordinary life.
3. Which method — and why this one?
Cell division: mitosis. Before division, in interphase, the DNA is copied. Then the nucleus divides: chromosomes become visible, line up, and the copies are pulled apart. The cell splits. Growth, repair and asexual reproduction use mitosis. The chromosome number stays the same. Mitosis does not make sperm or egg cells.
4. Step-by-step working
01 / 07
What it is
Mitosis is the division of a nucleus that makes two cells with the same genetic information as the parent cell.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
Before division, in interphase, the DNA is copied. Then the nucleus divides: chromosomes become visible, line up, and the copies are pulled apart. The cell splits. Growth, repair and asexual reproduction use mitosis. The chromosome number stays the same. Mitosis does not make sperm or egg cells.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A cut on a hand. The skin cells at the edge copy their DNA, then each nucleus divides by mitosis. The two daughter cells have the same chromosomes as the skin cell they came from. That is why the new skin matches the old skin. If the copies were shuffled into half the chromosomes, the repair would not be skin. That halving is meiosis, and it is not what a healing cut does.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Mitosis copies a cell for growth and repair. The chromosome number does not change. It is not how gametes are made.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Mitosis copies a cell for growth and repair. The chromosome number does not change. It is not how gametes are made.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Mitosis copies a cell for growth and repair. The chromosome number does not change. It is not how gametes are made.
Copy onto your answer sheet — in this order
Answer: Mitosis copies a cell for growth and repair. The chromosome number does not change. It is not how gametes are made.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to use mitosis and meiosis as the same word. Mitosis keeps the number. Meiosis halves it.
15 · 4 Marks · Support and transport in plants
Life Sciences Grade 10. Use this case. A scrape and a pulled hamstring. A graze on the knee is epithelial tissue torn. It covers. It does not shorten. A pulled hamstring is muscle tissue torn. It shortens, and that is why the leg gives way. Blood leaking from the scrape is a third tissue, connective, doing transport. Stitching the skin does not repair the muscle, because they are not the same tissue and they do not do the same job. In sentences, say what Plant and animal tissues is doing here, from the situation to the result.
Support and transport in plants
Notes: A slice of spinach stem and a smear of cheek cells show two tissues side by side.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. A scrape and a pulled hamstring. A graze on the knee is epithelial tissue torn. It covers. It does not shorten. A pulled hamstring is muscle tissue torn. It shortens, and that is why the leg gives way. Blood leaking from the scrape is a third tissue, connective, doing transport. Stitching the skin does not repair the muscle, because they are not the same tissue and they do not do the same job. In sentences, say what Plant and animal tissues is doing here, from the situation to the result.
In other words — as if you have never seen this before
Plant and animal tissues. Animal tissues: epithelial tissue covers and lines, connective tissue supports and transports (blood, bone, cartilage), muscle tissue contracts, nerve tissue carries impulses. Plant tissues: epidermis protects, parenchyma stores and photosynthesises, collenchyma and sclerenchyma support, xylem moves water, phloem moves sugars.
2. What do we already know?
A slice of spinach stem and a smear of cheek cells show two tissues side by side.
3. Which method — and why this one?
Plant and animal tissues. Animal tissues: epithelial tissue covers and lines, connective tissue supports and transports (blood, bone, cartilage), muscle tissue contracts, nerve tissue carries impulses. Plant tissues: epidermis protects, parenchyma stores and photosynthesises, collenchyma and sclerenchyma support, xylem moves water, phloem moves sugars.
4. Step-by-step working
01 / 07
What it is
A tissue is a group of cells with the same structure, doing the same job.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
Animal tissues: epithelial tissue covers and lines, connective tissue supports and transports (blood, bone, cartilage), muscle tissue contracts, nerve tissue carries impulses. Plant tissues: epidermis protects, parenchyma stores and photosynthesises, collenchyma and sclerenchyma support, xylem moves water, phloem moves sugars.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. The lining of the mouth and the skin of a leaf. Mouth lining is epithelial tissue: thin cells packed as a sheet, good at covering, poor at lifting a load. The strings in a spinach stem that are hard to chew are strengthening tissue, not the green flesh. The green flesh is parenchyma, the tissue that holds chloroplasts. Blood is a tissue even though it is liquid, because its cells share the job of transport. A single cell is not yet a tissue.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Tissue means similar cells, one job. Animals rely on epithelial, connective, muscle and nerve tissue. Plants rely on covering, packing, strengthening and transport tissue.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Tissue means similar cells, one job. Animals rely on epithelial, connective, muscle and nerve tissue. Plants rely on covering, packing, strengthening and transport tissue.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Tissue means similar cells, one job. Animals rely on epithelial, connective, muscle and nerve tissue. Plants rely on covering, packing, strengthening and transport tissue.
Copy onto your answer sheet — in this order
Answer: Tissue means similar cells, one job. Animals rely on epithelial, connective, muscle and nerve tissue. Plants rely on covering, packing, strengthening and transport tissue.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to call an organ, such as the heart, a tissue. The heart is an organ made of several tissues.
16 · 4 Marks · Plant organs: leaf, stem, root
Life Sciences Grade 10. Use this case. One leaf in a cupboard. A bean leaf left on the plant in the light stays green and makes starch. A leaf from the same plant, sealed in a cupboard for a week, turns pale. The root and the stem were still in the light on the windowsill plant. The failed part was the leaf that could not get light, so its chloroplasts stopped paying their way. Covering the pot does not test the leaf. Covering the leaf does. In sentences, say what Plant organs: leaf, stem, root is doing here, from the situation to the result.
Plant organs: leaf, stem, root
Notes: A bean plant in a cooldrink bottle is enough to see leaf, stem and root as three organs.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. One leaf in a cupboard. A bean leaf left on the plant in the light stays green and makes starch. A leaf from the same plant, sealed in a cupboard for a week, turns pale. The root and the stem were still in the light on the windowsill plant. The failed part was the leaf that could not get light, so its chloroplasts stopped paying their way. Covering the pot does not test the leaf. Covering the leaf does. In sentences, say what Plant organs: leaf, stem, root is doing here, from the situation to the result.
In other words — as if you have never seen this before
Plant organs: leaf, stem, root. The leaf is built to photosynthesise: a waxy cuticle, epidermis, palisade cells packed with chloroplasts, spongy cells with air spaces, and stomata that open for carbon dioxide and close to save water. The stem holds the plant up and carries xylem and phloem in vascular bundles. The root anchors the plant, grows hairs for a large surface, and takes up water and mineral salts. A flower is a reproductive organ, not a leaf.
2. What do we already know?
A bean plant in a cooldrink bottle is enough to see leaf, stem and root as three organs.
3. Which method — and why this one?
Plant organs: leaf, stem, root. The leaf is built to photosynthesise: a waxy cuticle, epidermis, palisade cells packed with chloroplasts, spongy cells with air spaces, and stomata that open for carbon dioxide and close to save water. The stem holds the plant up and carries xylem and phloem in vascular bundles. The root anchors the plant, grows hairs for a large surface, and takes up water and mineral salts. A flower is a reproductive organ, not a leaf.
4. Step-by-step working
01 / 07
What it is
An organ is several tissues working as one part. In a plant the leaf, stem and root are the organs you must be able to read.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
The leaf is built to photosynthesise: a waxy cuticle, epidermis, palisade cells packed with chloroplasts, spongy cells with air spaces, and stomata that open for carbon dioxide and close to save water. The stem holds the plant up and carries xylem and phloem in vascular bundles. The root anchors the plant, grows hairs for a large surface, and takes up water and mineral salts. A flower is a reproductive organ, not a leaf.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A tomato plant on a windowsill. The leaf faces the light so palisade cells can catch it. Stomata on the underside let carbon dioxide in. If those stomata stayed shut all day, photosynthesis would slow because carbon dioxide could not enter. The stem’s bundles move water up from the root and sugars down from the leaf. The root hairs, not the green leaf, are what meet the wet soil. Paint the leaf and you have not explained it. The explanation is what each tissue is for.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Leaf makes food, stem supports and transports, root anchors and absorbs. Each organ is tissues arranged for that job.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Leaf makes food, stem supports and transports, root anchors and absorbs. Each organ is tissues arranged for that job.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Leaf makes food, stem supports and transports, root anchors and absorbs. Each organ is tissues arranged for that job.
Copy onto your answer sheet — in this order
Answer: Leaf makes food, stem supports and transports, root anchors and absorbs. Each organ is tissues arranged for that job.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to say roots photosynthesise, or that stomata are for taking up soil water.
17 · 4 Marks · Support and transport in plants
Life Sciences Grade 10. Use this case. Ring-barked citrus tree. A ring of bark cut from a lemon tree swells above the cut within weeks. Sugars made in the leaves cannot pass the cut, because the phloem is in the bark. The tree still gets water for a while, because the xylem is deeper wood and was not removed. Fruit above the ring stays small once the stored sugars are used. That is how you can see the two pipes are not one pipe. In sentences, say what Support and transport in plants is doing here, from the situation to the result.
Support and transport in plants
Notes: A wilted mielie seedling after a hot Free State afternoon, recovering at night, is turgor and xylem in one story.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. Ring-barked citrus tree. A ring of bark cut from a lemon tree swells above the cut within weeks. Sugars made in the leaves cannot pass the cut, because the phloem is in the bark. The tree still gets water for a while, because the xylem is deeper wood and was not removed. Fruit above the ring stays small once the stored sugars are used. That is how you can see the two pipes are not one pipe. In sentences, say what Support and transport in plants is doing here, from the situation to the result.
In other words — as if you have never seen this before
Support and transport in plants. A full vacuole pushes the cytoplasm against a firm cell wall. That turgor is what keeps a soft stem upright. Xylem vessels are dead tubes stiffened with lignin. They carry water and salts from root to leaf. Phloem sieve tubes are living. They carry sugars from leaves to roots, fruits and growing tips, in either direction as the plant needs. Transpiration, the loss of water vapour from leaves, pulls more water up the xylem.
2. What do we already know?
A wilted mielie seedling after a hot Free State afternoon, recovering at night, is turgor and xylem in one story.
3. Which method — and why this one?
Support and transport in plants. A full vacuole pushes the cytoplasm against a firm cell wall. That turgor is what keeps a soft stem upright. Xylem vessels are dead tubes stiffened with lignin. They carry water and salts from root to leaf. Phloem sieve tubes are living. They carry sugars from leaves to roots, fruits and growing tips, in either direction as the plant needs. Transpiration, the loss of water vapour from leaves, pulls more water up the xylem.
4. Step-by-step working
01 / 07
What it is
Plants stand up and move materials with turgor pressure and with two transport tissues, xylem and phloem.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
A full vacuole pushes the cytoplasm against a firm cell wall. That turgor is what keeps a soft stem upright. Xylem vessels are dead tubes stiffened with lignin. They carry water and salts from root to leaf. Phloem sieve tubes are living. They carry sugars from leaves to roots, fruits and growing tips, in either direction as the plant needs. Transpiration, the loss of water vapour from leaves, pulls more water up the xylem.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A spinach bunch left on the counter versus one in a jar of water. Out of water the vacuoles shrink, turgor falls, and the leaves wilt. In water the xylem refills, vacuoles firm up, and the bunch stands. The sugars made in the leaves do not travel in that same water pipe. They travel in the phloem. Block the phloem, as a ring of bark cut from a tree does, and sugars pile up above the cut while water can still rise in the deeper xylem.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Turgor holds soft parts up. Xylem moves water up. Phloem moves sugars. Transpiration is the pull.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Turgor holds soft parts up. Xylem moves water up. Phloem moves sugars. Transpiration is the pull.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Turgor holds soft parts up. Xylem moves water up. Phloem moves sugars. Transpiration is the pull.
Copy onto your answer sheet — in this order
Answer: Turgor holds soft parts up. Xylem moves water up. Phloem moves sugars. Transpiration is the pull.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to send sugars up the xylem, or to say xylem cells are alive and full of chloroplasts.
18 · 8 Marks · Support systems in animals
Life Sciences Grade 10. Use this case. Lifting a school bag. To bend the elbow and lift a bag, the biceps contracts and the triceps lets go. To straighten the arm and put the bag down, the triceps contracts and the biceps lets go. Neither muscle can push. The humerus is the lever they pull on. A learner who says the biceps both lifts and straightens has given one muscle two opposite jobs. The pair is the system. In sentences, say what Support systems in animals is doing here, from the situation to the result.
Support systems in animals
Notes: A netballer’s knee hinge and shoulder socket are the two joints in one game.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. Lifting a school bag. To bend the elbow and lift a bag, the biceps contracts and the triceps lets go. To straighten the arm and put the bag down, the triceps contracts and the biceps lets go. Neither muscle can push. The humerus is the lever they pull on. A learner who says the biceps both lifts and straightens has given one muscle two opposite jobs. The pair is the system. In sentences, say what Support systems in animals is doing here, from the situation to the result.
In other words — as if you have never seen this before
Support systems in animals. Bone is living tissue with calcium salts for hardness. Joints are where bones meet: a hinge, like the knee, bends one way; a ball-and-socket, like the shoulder, turns in many directions. Cartilage cushions. Ligaments hold bone to bone. Tendons hold muscle to bone. Muscles only pull. A pair of muscles works against each other so a limb can bend and straighten.
2. What do we already know?
A netballer’s knee hinge and shoulder socket are the two joints in one game.
3. Which method — and why this one?
Support systems in animals. Bone is living tissue with calcium salts for hardness. Joints are where bones meet: a hinge, like the knee, bends one way; a ball-and-socket, like the shoulder, turns in many directions. Cartilage cushions. Ligaments hold bone to bone. Tendons hold muscle to bone. Muscles only pull. A pair of muscles works against each other so a limb can bend and straighten.
4. Step-by-step working
01 / 07
What it is
The human skeleton supports the body, protects organs, lets muscles move the bones, stores minerals and makes blood cells.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
Bone is living tissue with calcium salts for hardness. Joints are where bones meet: a hinge, like the knee, bends one way; a ball-and-socket, like the shoulder, turns in many directions. Cartilage cushions. Ligaments hold bone to bone. Tendons hold muscle to bone. Muscles only pull. A pair of muscles works against each other so a limb can bend and straighten.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. Bending the elbow. The biceps contracts and pulls the forearm up. The triceps is relaxed. To straighten the arm the triceps pulls and the biceps lets go. The elbow is a hinge, so the forearm does not spin like a shoulder. The skull is not a joint for movement. It is a case that protects the brain. A broken bone can heal because bone is living tissue, not dry plastic.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Skeleton means support, protection, movement, minerals and blood cells. Muscles pull in pairs. Joint type limits the movement.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Skeleton means support, protection, movement, minerals and blood cells. Muscles pull in pairs. Joint type limits the movement.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Skeleton means support, protection, movement, minerals and blood cells. Muscles pull in pairs. Joint type limits the movement.
Copy onto your answer sheet — in this order
Answer: Skeleton means support, protection, movement, minerals and blood cells. Muscles pull in pairs. Joint type limits the movement.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to say muscles push, or that ligaments and tendons are the same strap.
19 · 4 Marks · Transport systems in mammals
Life Sciences Grade 10. Use this case. The pulmonary artery. Blood leaving the right ventricle toward the lungs is in an artery, because it is going away from the heart, and it is low in oxygen. Blood leaving the left ventricle in the aorta is also in an artery, and it is high in oxygen. The word artery does not mean red. At the lungs the pulmonary vein, going back to the heart, is the vessel that is suddenly oxygen-rich. In sentences, say what Transport systems in mammals is doing here, from the situation to the result.
Transport systems in mammals
Notes: The pulse at the wrist is an artery. The vessel a nurse draws blood from in the arm is a vein.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. The pulmonary artery. Blood leaving the right ventricle toward the lungs is in an artery, because it is going away from the heart, and it is low in oxygen. Blood leaving the left ventricle in the aorta is also in an artery, and it is high in oxygen. The word artery does not mean red. At the lungs the pulmonary vein, going back to the heart, is the vessel that is suddenly oxygen-rich. In sentences, say what Transport systems in mammals is doing here, from the situation to the result.
In other words — as if you have never seen this before
Transport systems in mammals. The right side of the heart sends blood to the lungs. The left side sends blood to the body. Arteries carry blood away from the heart under high pressure, with thick walls. Veins carry blood back, with thinner walls and valves so it does not fall back. Capillaries are one cell thick, so oxygen, carbon dioxide and food can diffuse. Valves in the heart keep the flow one way. The wall of the left ventricle is thickest because it must push blood through the whole body.
2. What do we already know?
The pulse at the wrist is an artery. The vessel a nurse draws blood from in the arm is a vein.
3. Which method — and why this one?
Transport systems in mammals. The right side of the heart sends blood to the lungs. The left side sends blood to the body. Arteries carry blood away from the heart under high pressure, with thick walls. Veins carry blood back, with thinner walls and valves so it does not fall back. Capillaries are one cell thick, so oxygen, carbon dioxide and food can diffuse. Valves in the heart keep the flow one way. The wall of the left ventricle is thickest because it must push blood through the whole body.
4. Step-by-step working
01 / 07
What it is
Mammals move oxygen, food and wastes in blood, pushed by a four-chambered heart through a double circulation.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
The right side of the heart sends blood to the lungs. The left side sends blood to the body. Arteries carry blood away from the heart under high pressure, with thick walls. Veins carry blood back, with thinner walls and valves so it does not fall back. Capillaries are one cell thick, so oxygen, carbon dioxide and food can diffuse. Valves in the heart keep the flow one way. The wall of the left ventricle is thickest because it must push blood through the whole body.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A learner runs to the taxi rank. Leg muscles need more oxygen. The left ventricle pushes oxygen-rich blood into the aorta and out through arteries. At the muscle capillaries, oxygen leaves and carbon dioxide enters. Veins bring that darker blood back to the right atrium, the right ventricle sends it to the lungs, and only then does it return to the left side. If a vein had no valves in the leg, blood would pool. If someone calls every red vessel an artery, they have skipped the rule: artery means away from the heart, not “the red one”.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Double circulation: heart to lungs, heart to body. Arteries away, veins back, capillaries exchange. Left ventricle is the strongest pump.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Double circulation: heart to lungs, heart to body. Arteries away, veins back, capillaries exchange. Left ventricle is the strongest pump.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Double circulation: heart to lungs, heart to body. Arteries away, veins back, capillaries exchange. Left ventricle is the strongest pump.
Copy onto your answer sheet — in this order
Answer: Double circulation: heart to lungs, heart to body. Arteries away, veins back, capillaries exchange. Left ventricle is the strongest pump.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to say arteries always carry oxygenated blood. The pulmonary artery carries oxygen-poor blood to the lungs.
20 · 4 Marks · Support systems in animals
Life Sciences Grade 10. Use this case. A rock pool at Kalk Bay. At low tide a pool on the rocks heats up, the water gets saltier as it evaporates, and a limpet that cannot clamp down dries out. High tide brings cooler water back. The animals that live there are the ones that survive those hours, not every animal that can swim. Temperature, salt and drying are abiotic. The limpet is biotic. A food chain drawn for the pool that ignores the tide has missed the limit that actually decides who stays. In sentences, say what Biosphere to ecosystems is doing here, from the situation to the result.
Support systems in animals
Notes: Grassland, savanna, fynbos and Nama Karoo are the biomes a South African map is asking you to picture.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. A rock pool at Kalk Bay. At low tide a pool on the rocks heats up, the water gets saltier as it evaporates, and a limpet that cannot clamp down dries out. High tide brings cooler water back. The animals that live there are the ones that survive those hours, not every animal that can swim. Temperature, salt and drying are abiotic. The limpet is biotic. A food chain drawn for the pool that ignores the tide has missed the limit that actually decides who stays. In sentences, say what Biosphere to ecosystems is doing here, from the situation to the result.
In other words — as if you have never seen this before
Biosphere to ecosystems. The biosphere is every place life exists. A biome is a large climate region, such as grassland or fynbos. An ecosystem is the living community plus the non-living soil, water and climate. A population is one species in one place. A community is all the populations together. Producers make food. Consumers eat. Decomposers return nutrients. In a food chain, only about a tenth of the energy passes to the next level, so pyramids of energy narrow upwards.
2. What do we already know?
Grassland, savanna, fynbos and Nama Karoo are the biomes a South African map is asking you to picture.
3. Which method — and why this one?
Biosphere to ecosystems. The biosphere is every place life exists. A biome is a large climate region, such as grassland or fynbos. An ecosystem is the living community plus the non-living soil, water and climate. A population is one species in one place. A community is all the populations together. Producers make food. Consumers eat. Decomposers return nutrients. In a food chain, only about a tenth of the energy passes to the next level, so pyramids of energy narrow upwards.
4. Step-by-step working
01 / 07
What it is
Life is organised from the whole living layer of Earth down to one organism, and energy moves through that organisation in food chains.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
The biosphere is every place life exists. A biome is a large climate region, such as grassland or fynbos. An ecosystem is the living community plus the non-living soil, water and climate. A population is one species in one place. A community is all the populations together. Producers make food. Consumers eat. Decomposers return nutrients. In a food chain, only about a tenth of the energy passes to the next level, so pyramids of energy narrow upwards.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A Highveld grassland after rain. Grass is the producer. A locust eats grass. A bird eats locusts. Energy entered as sunlight and was trapped by the grass. Most of that energy was used by the grass itself, so the bird receives only a scrap of the original light. There cannot be more hawks than grass. Fynbos in the Cape is a different biome, not a different definition of ecosystem. Remove the decomposers and nutrients stay locked in dead leaves, so the grass eventually fails.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Biosphere, biome, ecosystem, community, population, organism. Energy enters from the sun and thins at each step of the food chain.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Biosphere, biome, ecosystem, community, population, organism. Energy enters from the sun and thins at each step of the food chain.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Biosphere, biome, ecosystem, community, population, organism. Energy enters from the sun and thins at each step of the food chain.
Copy onto your answer sheet — in this order
Answer: Biosphere, biome, ecosystem, community, population, organism. Energy enters from the sun and thins at each step of the food chain.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to draw a pyramid of energy with the top wider than the producers, or to call a herd of springbok a community.
21 · 4 Marks · Biodiversity and classification
Life Sciences Grade 10. Use this case. Panthera leo and a garden aloe. A lion is Panthera leo: genus Panthera, species leo. A leopard is Panthera pardus, same genus, different species. They do not produce fertile young together. An aloe is a plant. A mushroom on the same rock is a fungus: no chloroplasts, it feeds on dead matter. Calling both “plants” because neither walks is the wrong rank. The kingdom is decided by how the organism feeds and what its cells are. In sentences, say what Biodiversity and classification is doing here, from the situation to the result.
Biodiversity and classification
Notes: Aloes, fynbos proteas and invasive wattles are the local picture of indigenous versus alien.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. Panthera leo and a garden aloe. A lion is Panthera leo: genus Panthera, species leo. A leopard is Panthera pardus, same genus, different species. They do not produce fertile young together. An aloe is a plant. A mushroom on the same rock is a fungus: no chloroplasts, it feeds on dead matter. Calling both “plants” because neither walks is the wrong rank. The kingdom is decided by how the organism feeds and what its cells are. In sentences, say what Biodiversity and classification is doing here, from the situation to the result.
In other words — as if you have never seen this before
Biodiversity and classification. The ranks run from large to small: kingdom, phylum, class, order, family, genus, species. A species is a group that can interbreed and produce fertile young. Scientific names have two words, genus then species, written so the genus starts with a capital. The five kingdoms you meet are bacteria, protists, fungi, plants and animals. A virus is not in those kingdoms. It is not a cell.
2. What do we already know?
Aloes, fynbos proteas and invasive wattles are the local picture of indigenous versus alien.
3. Which method — and why this one?
Biodiversity and classification. The ranks run from large to small: kingdom, phylum, class, order, family, genus, species. A species is a group that can interbreed and produce fertile young. Scientific names have two words, genus then species, written so the genus starts with a capital. The five kingdoms you meet are bacteria, protists, fungi, plants and animals. A virus is not in those kingdoms. It is not a cell.
4. Step-by-step working
01 / 07
What it is
Biodiversity is the variety of life. Classification is how we organise that variety so a name means the same organism everywhere.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
The ranks run from large to small: kingdom, phylum, class, order, family, genus, species. A species is a group that can interbreed and produce fertile young. Scientific names have two words, genus then species, written so the genus starts with a capital. The five kingdoms you meet are bacteria, protists, fungi, plants and animals. A virus is not in those kingdoms. It is not a cell.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. Two beetles that look similar in a garden. If they cannot produce fertile offspring together, they are not one species, even if the colour matches. Their names would differ in the second word. A mushroom is a fungus, not a plant: it does not photosynthesise. An aloe is a plant. Grouping the aloe with the mushroom because both “sit still” ignores how they feed. Indigenous species evolved here. An alien species was brought in and can crowd local ones out.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Classification narrows from kingdom to species. A scientific name is genus plus species. Feeding and cell type decide the kingdom, not just the shape.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Classification narrows from kingdom to species. A scientific name is genus plus species. Feeding and cell type decide the kingdom, not just the shape.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Classification narrows from kingdom to species. A scientific name is genus plus species. Feeding and cell type decide the kingdom, not just the shape.
Copy onto your answer sheet — in this order
Answer: Classification narrows from kingdom to species. A scientific name is genus plus species. Feeding and cell type decide the kingdom, not just the shape.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to place viruses in the kingdom of bacteria, or to treat the common name “lily” as a scientific name.
22 · 4 Marks · Support systems in animals
Life Sciences Grade 10. Use this case. Before the dinosaurs. The oldest fossils are not bones. They are traces of microbial life, far older than any dinosaur. Dinosaurs appear later, and they are already gone before Homo sapiens exists. A chart that puts a person, a dinosaur and the first cells in one box called “prehistoric” deletes the order. The theory is the sequence. The pictures only help if the dates stay in line. In sentences, say what History of life on Earth is doing here, from the situation to the result.
Support systems in animals
Notes: Karoo fossils and the Cradle of Humankind are the two South African places this story stands on.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Life Sciences Grade 10. Use this case. Before the dinosaurs. The oldest fossils are not bones. They are traces of microbial life, far older than any dinosaur. Dinosaurs appear later, and they are already gone before Homo sapiens exists. A chart that puts a person, a dinosaur and the first cells in one box called “prehistoric” deletes the order. The theory is the sequence. The pictures only help if the dates stay in line. In sentences, say what History of life on Earth is doing here, from the situation to the result.
In other words — as if you have never seen this before
History of life on Earth. Fossils are preserved remains or traces. In undisturbed rock, deeper layers are older. Over hundreds of millions of years, life changed: simple cells, then animals in the seas, then plants and animals on land, then later the groups we know. Mass extinctions cut that history. Continental drift moved the landmasses the fossils sit on. Humans appear very late in that timeline.
2. What do we already know?
Karoo fossils and the Cradle of Humankind are the two South African places this story stands on.
3. Which method — and why this one?
History of life on Earth. Fossils are preserved remains or traces. In undisturbed rock, deeper layers are older. Over hundreds of millions of years, life changed: simple cells, then animals in the seas, then plants and animals on land, then later the groups we know. Mass extinctions cut that history. Continental drift moved the landmasses the fossils sit on. Humans appear very late in that timeline.
4. Step-by-step working
01 / 07
What it is
Life on Earth has a history that is read from rocks, fossils and the order of the layers they sit in.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
02 / 07
How it works
Fossils are preserved remains or traces. In undisturbed rock, deeper layers are older. Over hundreds of millions of years, life changed: simple cells, then animals in the seas, then plants and animals on land, then later the groups we know. Mass extinctions cut that history. Continental drift moved the landmasses the fossils sit on. Humans appear very late in that timeline.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
03 / 07
Worked theory
Worked theory. A quarry face in the Karoo. A fossil reptile in a lower layer cannot be younger than a fossil in the layer above it, unless the rocks have been overturned. The fossil is evidence that an animal with that body once lived there, not a drawing someone buried. If the same kind of fossil turns up in South America and in Africa, one explanation is that those continents were once joined. The theory is the timeline plus the evidence, not a list of names to memorise with no order.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
04 / 07
Say it back
Fossils in rock order are the evidence for the history of life. Deeper usually means older. Life changed over a very long time.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Fossils in rock order are the evidence for the history of life. Deeper usually means older. Life changed over a very long time.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Fossils in rock order are the evidence for the history of life. Deeper usually means older. Life changed over a very long time.
Copy onto your answer sheet — in this order
Answer: Fossils in rock order are the evidence for the history of life. Deeper usually means older. Life changed over a very long time.
6. Check it like a marker
The answer names the situation, what changed, and the result. It does not stop at a heading.
7. A trap first-timers fall into
A common mix-up is to put humans near the start of the timeline, or to treat a fossil as a living relative you could meet.
23 · 2 Marks · Cells: the basic units of life
What is the answer to keep for Cells: the basic units of life?
Cells: the basic units of life
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: What is the answer to keep for Cells: the basic units of life?
In other words — as if you have never seen this before
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
2. What do we already know?
Copy these onto the left of your page, one per line, with units: every number and its unit in the sentence. Mixing cm with m, or minutes with seconds, loses a method mark.
3. Which method — and why this one?
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
4. Step-by-step working
01 / 07
Step A — Read the question twice
Slow down. Circle the word that names the unknown. Underline every number and its unit. Do not grab a formula yet — first decide what the paper is actually asking.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
02 / 07
Step B — Write the given in a column
Copy these onto the left of your page, one per line, with units: every number and its unit in the sentence. Mixing cm with m, or minutes with seconds, loses a method mark.
Why this step: A column with units stops you mixing cm with m, or minutes with seconds. Markers can also see you started correctly.
03 / 07
Step C — Name the method in words
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
04 / 07
Working
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
Copy onto your answer sheet — in this order
Answer: Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
6. Check it like a marker
Does your answer appear as one of the options? Do the units match what was asked (m, N, J, °)? If you put the number back into the original equation, does it still hold? Estimate: is the size sensible?
7. A trap first-timers fall into
First-timers often grab the first formula they remember, mix units (cm with m, minutes with seconds), or drop a minus sign. Write the formula in words first: “this equals that, because…”
24 · 2 Marks · The chemistry of life
Worked theory. A maize porridge meal. The starch in the maize is a carbohydrate. Iodine on a scrap goes blue-black, so starch is there. The milk on the side has protein, so Biuret would go purple. Cooking does not turn starch into protein. An enzyme in saliva, amylase, starts breaking that starch into sugar, but only while it is the right shape. Boiling the saliva first would denature the enzyme and the starch would stay starch. What does this case show about The chemistry of life?
The chemistry of life
Notes: The chemistry of life is the small set of molecules every living thing is built from: water, carbohydrates, proteins, lipids and nucleic acids.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Worked theory. A maize porridge meal. The starch in the maize is a carbohydrate. Iodine on a scrap goes blue-black, so starch is there. The milk on the side has protein, so Biuret would go purple. Cooking does not turn starch into protein. An enzyme in saliva, amylase, starts breaking that starch into sugar, but only while it is the right shape. Boiling the saliva first would denature the enzyme and the starch would stay starch. What does this case show about The chemistry of life?
In other words — as if you have never seen this before
Living tissue is water plus carbohydrates, proteins, lipids and nucleic acids. Food tests identify them. Enzymes are proteins that fail if their shape is lost.
2. What do we already know?
The chemistry of life is the small set of molecules every living thing is built from: water, carbohydrates, proteins, lipids and nucleic acids.
3. Which method — and why this one?
Living tissue is water plus carbohydrates, proteins, lipids and nucleic acids. Food tests identify them. Enzymes are proteins that fail if their shape is lost.
4. Step-by-step working
01 / 07
Step A — Read the question twice
Slow down. Circle the word that names the unknown. Underline every number and its unit. Do not grab a formula yet — first decide what the paper is actually asking.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
02 / 07
Step B — Write the given in a column
The chemistry of life is the small set of molecules every living thing is built from: water, carbohydrates, proteins, lipids and nucleic acids.
Why this step: A column with units stops you mixing cm with m, or minutes with seconds. Markers can also see you started correctly.
03 / 07
Step C — Name the method in words
Living tissue is water plus carbohydrates, proteins, lipids and nucleic acids. Food tests identify them. Enzymes are proteins that fail if their shape is lost.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
04 / 07
Working
Water is the solvent. Carbohydrates store and supply energy. Proteins do the work, including enzymes. Lipids store energy and build membranes. Nucleic acids store the instructions. Enzymes are proteins that speed one reaction. Heat or the wrong pH changes their shape, so they stop working. Food tests name the molecule: iodine turns blue-black with starch, Biuret turns purple with protein, Benedict’s turns orange with a reducing sugar, and an ethanol emulsion shows fat.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Living tissue is water plus carbohydrates, proteins, lipids and nucleic acids. Food tests identify them. Enzymes are proteins that fail if their shape is lost.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Living tissue is water plus carbohydrates, proteins, lipids and nucleic acids. Food tests identify them. Enzymes are proteins that fail if their shape is lost.
Copy onto your answer sheet — in this order
Answer: Living tissue is water plus carbohydrates, proteins, lipids and nucleic acids. Food tests identify them. Enzymes are proteins that fail if their shape is lost.
6. Check it like a marker
Does your answer appear as one of the options? Do the units match what was asked (m, N, J, °)? If you put the number back into the original equation, does it still hold? Estimate: is the size sensible?
7. A trap first-timers fall into
First-timers often grab the first formula they remember, mix units (cm with m, minutes with seconds), or drop a minus sign. Write the formula in words first: “this equals that, because…”
25 · 2 Marks · Support and transport in plants
What is the answer to keep for Support and transport in plants?
Support and transport in plants
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: What is the answer to keep for Support and transport in plants?
In other words — as if you have never seen this before
Turgor holds soft parts up. Xylem moves water up. Phloem moves sugars. Transpiration is the pull.
2. What do we already know?
Copy these onto the left of your page, one per line, with units: every number and its unit in the sentence. Mixing cm with m, or minutes with seconds, loses a method mark.
3. Which method — and why this one?
Turgor holds soft parts up. Xylem moves water up. Phloem moves sugars. Transpiration is the pull.
4. Step-by-step working
01 / 07
Step A — Read the question twice
Slow down. Circle the word that names the unknown. Underline every number and its unit. Do not grab a formula yet — first decide what the paper is actually asking.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
02 / 07
Step B — Write the given in a column
Copy these onto the left of your page, one per line, with units: every number and its unit in the sentence. Mixing cm with m, or minutes with seconds, loses a method mark.
Why this step: A column with units stops you mixing cm with m, or minutes with seconds. Markers can also see you started correctly.
03 / 07
Step C — Name the method in words
Turgor holds soft parts up. Xylem moves water up. Phloem moves sugars. Transpiration is the pull.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
04 / 07
Working
Turgor holds soft parts up. Xylem moves water up. Phloem moves sugars. Transpiration is the pull.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Turgor holds soft parts up. Xylem moves water up. Phloem moves sugars. Transpiration is the pull.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Turgor holds soft parts up. Xylem moves water up. Phloem moves sugars. Transpiration is the pull.
Copy onto your answer sheet — in this order
Answer: Turgor holds soft parts up. Xylem moves water up. Phloem moves sugars. Transpiration is the pull.
6. Check it like a marker
Does your answer appear as one of the options? Do the units match what was asked (m, N, J, °)? If you put the number back into the original equation, does it still hold? Estimate: is the size sensible?
7. A trap first-timers fall into
First-timers often grab the first formula they remember, mix units (cm with m, minutes with seconds), or drop a minus sign. Write the formula in words first: “this equals that, because…”
26 · 2 Marks · Biosphere to ecosystems
What is the answer to keep for Biosphere to ecosystems?
Biosphere to ecosystems
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: What is the answer to keep for Biosphere to ecosystems?
In other words — as if you have never seen this before
Biosphere, biome, ecosystem, community, population, organism. Energy enters from the sun and thins at each step of the food chain.
2. What do we already know?
Copy these onto the left of your page, one per line, with units: every number and its unit in the sentence. Mixing cm with m, or minutes with seconds, loses a method mark.
3. Which method — and why this one?
Biosphere, biome, ecosystem, community, population, organism. Energy enters from the sun and thins at each step of the food chain.
4. Step-by-step working
01 / 07
Step A — Read the question twice
Slow down. Circle the word that names the unknown. Underline every number and its unit. Do not grab a formula yet — first decide what the paper is actually asking.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
02 / 07
Step B — Write the given in a column
Copy these onto the left of your page, one per line, with units: every number and its unit in the sentence. Mixing cm with m, or minutes with seconds, loses a method mark.
Why this step: A column with units stops you mixing cm with m, or minutes with seconds. Markers can also see you started correctly.
03 / 07
Step C — Name the method in words
Biosphere, biome, ecosystem, community, population, organism. Energy enters from the sun and thins at each step of the food chain.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
04 / 07
Working
Biosphere, biome, ecosystem, community, population, organism. Energy enters from the sun and thins at each step of the food chain.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Biosphere, biome, ecosystem, community, population, organism. Energy enters from the sun and thins at each step of the food chain.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Biosphere, biome, ecosystem, community, population, organism. Energy enters from the sun and thins at each step of the food chain.
Copy onto your answer sheet — in this order
Answer: Biosphere, biome, ecosystem, community, population, organism. Energy enters from the sun and thins at each step of the food chain.
6. Check it like a marker
Does your answer appear as one of the options? Do the units match what was asked (m, N, J, °)? If you put the number back into the original equation, does it still hold? Estimate: is the size sensible?
7. A trap first-timers fall into
First-timers often grab the first formula they remember, mix units (cm with m, minutes with seconds), or drop a minus sign. Write the formula in words first: “this equals that, because…”
27 · 2 Marks · History of life on Earth
Worked theory. A quarry face in the Karoo. A fossil reptile in a lower layer cannot be younger than a fossil in the layer above it, unless the rocks have been overturned. The fossil is evidence that an animal with that body once lived there, not a drawing someone buried. If the same kind of fossil turns up in South America and in Africa, one explanation is that those continents were once joined. The theory is the timeline plus the evidence, not a list of names to memorise with no order. What does this case show about History of life on Earth?
History of life on Earth
Notes: Life on Earth has a history that is read from rocks, fossils and the order of the layers they sit in.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Worked theory. A quarry face in the Karoo. A fossil reptile in a lower layer cannot be younger than a fossil in the layer above it, unless the rocks have been overturned. The fossil is evidence that an animal with that body once lived there, not a drawing someone buried. If the same kind of fossil turns up in South America and in Africa, one explanation is that those continents were once joined. The theory is the timeline plus the evidence, not a list of names to memorise with no order. What does this case show about History of life on Earth?
In other words — as if you have never seen this before
Fossils in rock order are the evidence for the history of life. Deeper usually means older. Life changed over a very long time.
2. What do we already know?
Life on Earth has a history that is read from rocks, fossils and the order of the layers they sit in.
3. Which method — and why this one?
Fossils in rock order are the evidence for the history of life. Deeper usually means older. Life changed over a very long time.
4. Step-by-step working
01 / 07
Step A — Read the question twice
Slow down. Circle the word that names the unknown. Underline every number and its unit. Do not grab a formula yet — first decide what the paper is actually asking.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
02 / 07
Step B — Write the given in a column
Life on Earth has a history that is read from rocks, fossils and the order of the layers they sit in.
Why this step: A column with units stops you mixing cm with m, or minutes with seconds. Markers can also see you started correctly.
03 / 07
Step C — Name the method in words
Fossils in rock order are the evidence for the history of life. Deeper usually means older. Life changed over a very long time.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
04 / 07
Working
Fossils are preserved remains or traces. In undisturbed rock, deeper layers are older. Over hundreds of millions of years, life changed: simple cells, then animals in the seas, then plants and animals on land, then later the groups we know. Mass extinctions cut that history. Continental drift moved the landmasses the fossils sit on. Humans appear very late in that timeline.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Fossils in rock order are the evidence for the history of life. Deeper usually means older. Life changed over a very long time.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Fossils in rock order are the evidence for the history of life. Deeper usually means older. Life changed over a very long time.
Copy onto your answer sheet — in this order
Answer: Fossils in rock order are the evidence for the history of life. Deeper usually means older. Life changed over a very long time.
6. Check it like a marker
Does your answer appear as one of the options? Do the units match what was asked (m, N, J, °)? If you put the number back into the original equation, does it still hold? Estimate: is the size sensible?
7. A trap first-timers fall into
First-timers often grab the first formula they remember, mix units (cm with m, minutes with seconds), or drop a minus sign. Write the formula in words first: “this equals that, because…”
28 · 2 Marks · Plant and animal tissues
What is the answer to keep for Plant and animal tissues?
Plant and animal tissues
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: What is the answer to keep for Plant and animal tissues?
In other words — as if you have never seen this before
Tissue means similar cells, one job. Animals rely on epithelial, connective, muscle and nerve tissue. Plants rely on covering, packing, strengthening and transport tissue.
2. What do we already know?
Copy these onto the left of your page, one per line, with units: every number and its unit in the sentence. Mixing cm with m, or minutes with seconds, loses a method mark.
3. Which method — and why this one?
Tissue means similar cells, one job. Animals rely on epithelial, connective, muscle and nerve tissue. Plants rely on covering, packing, strengthening and transport tissue.
4. Step-by-step working
01 / 07
Step A — Read the question twice
Slow down. Circle the word that names the unknown. Underline every number and its unit. Do not grab a formula yet — first decide what the paper is actually asking.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
02 / 07
Step B — Write the given in a column
Copy these onto the left of your page, one per line, with units: every number and its unit in the sentence. Mixing cm with m, or minutes with seconds, loses a method mark.
Why this step: A column with units stops you mixing cm with m, or minutes with seconds. Markers can also see you started correctly.
03 / 07
Step C — Name the method in words
Tissue means similar cells, one job. Animals rely on epithelial, connective, muscle and nerve tissue. Plants rely on covering, packing, strengthening and transport tissue.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
04 / 07
Working
Tissue means similar cells, one job. Animals rely on epithelial, connective, muscle and nerve tissue. Plants rely on covering, packing, strengthening and transport tissue.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Tissue means similar cells, one job. Animals rely on epithelial, connective, muscle and nerve tissue. Plants rely on covering, packing, strengthening and transport tissue.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Tissue means similar cells, one job. Animals rely on epithelial, connective, muscle and nerve tissue. Plants rely on covering, packing, strengthening and transport tissue.
Copy onto your answer sheet — in this order
Answer: Tissue means similar cells, one job. Animals rely on epithelial, connective, muscle and nerve tissue. Plants rely on covering, packing, strengthening and transport tissue.
6. Check it like a marker
Does your answer appear as one of the options? Do the units match what was asked (m, N, J, °)? If you put the number back into the original equation, does it still hold? Estimate: is the size sensible?
7. A trap first-timers fall into
First-timers often grab the first formula they remember, mix units (cm with m, minutes with seconds), or drop a minus sign. Write the formula in words first: “this equals that, because…”
29 · 2 Marks · Cell division: mitosis
Worked theory. A cut on a hand. The skin cells at the edge copy their DNA, then each nucleus divides by mitosis. The two daughter cells have the same chromosomes as the skin cell they came from. That is why the new skin matches the old skin. If the copies were shuffled into half the chromosomes, the repair would not be skin. That halving is meiosis, and it is not what a healing cut does. What does this case show about Cell division: mitosis?
Cell division: mitosis
Notes: Mitosis is the division of a nucleus that makes two cells with the same genetic information as the parent cell.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Worked theory. A cut on a hand. The skin cells at the edge copy their DNA, then each nucleus divides by mitosis. The two daughter cells have the same chromosomes as the skin cell they came from. That is why the new skin matches the old skin. If the copies were shuffled into half the chromosomes, the repair would not be skin. That halving is meiosis, and it is not what a healing cut does. What does this case show about Cell division: mitosis?
In other words — as if you have never seen this before
Mitosis copies a cell for growth and repair. The chromosome number does not change. It is not how gametes are made.
2. What do we already know?
Mitosis is the division of a nucleus that makes two cells with the same genetic information as the parent cell.
3. Which method — and why this one?
Mitosis copies a cell for growth and repair. The chromosome number does not change. It is not how gametes are made.
4. Step-by-step working
01 / 07
Step A — Read the question twice
Slow down. Circle the word that names the unknown. Underline every number and its unit. Do not grab a formula yet — first decide what the paper is actually asking.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
02 / 07
Step B — Write the given in a column
Mitosis is the division of a nucleus that makes two cells with the same genetic information as the parent cell.
Why this step: A column with units stops you mixing cm with m, or minutes with seconds. Markers can also see you started correctly.
03 / 07
Step C — Name the method in words
Mitosis copies a cell for growth and repair. The chromosome number does not change. It is not how gametes are made.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
04 / 07
Working
Before division, in interphase, the DNA is copied. Then the nucleus divides: chromosomes become visible, line up, and the copies are pulled apart. The cell splits. Growth, repair and asexual reproduction use mitosis. The chromosome number stays the same. Mitosis does not make sperm or egg cells.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Mitosis copies a cell for growth and repair. The chromosome number does not change. It is not how gametes are made.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Mitosis copies a cell for growth and repair. The chromosome number does not change. It is not how gametes are made.
Copy onto your answer sheet — in this order
Answer: Mitosis copies a cell for growth and repair. The chromosome number does not change. It is not how gametes are made.
6. Check it like a marker
Does your answer appear as one of the options? Do the units match what was asked (m, N, J, °)? If you put the number back into the original equation, does it still hold? Estimate: is the size sensible?
7. A trap first-timers fall into
First-timers often grab the first formula they remember, mix units (cm with m, minutes with seconds), or drop a minus sign. Write the formula in words first: “this equals that, because…”
30 · 2 Marks · Cells: the basic units of life
Worked theory. A leaf cell and a cheek cell. The leaf cell stays box-shaped because the wall holds it, and it is green because chloroplasts catch light. The cheek cell is soft-edged, has no green chloroplasts, and cannot make food from light. Both still have a nucleus and mitochondria, so both are alive and both need energy. Killing the nucleus does not leave a working cell. The membrane is the gate, not a decoration. What does this case show about Cells: the basic units of life?
Cells: the basic units of life
Notes: A cell is the smallest living unit. Plants and animals are both made of cells, but the cells are not the same.
How we got there
Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.
Explain in another language · 11
1. What is the question asking?
Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Worked theory. A leaf cell and a cheek cell. The leaf cell stays box-shaped because the wall holds it, and it is green because chloroplasts catch light. The cheek cell is soft-edged, has no green chloroplasts, and cannot make food from light. Both still have a nucleus and mitochondria, so both are alive and both need energy. Killing the nucleus does not leave a working cell. The membrane is the gate, not a decoration. What does this case show about Cells: the basic units of life?
In other words — as if you have never seen this before
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
2. What do we already know?
A cell is the smallest living unit. Plants and animals are both made of cells, but the cells are not the same.
3. Which method — and why this one?
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
4. Step-by-step working
01 / 07
Step A — Read the question twice
Slow down. Circle the word that names the unknown. Underline every number and its unit. Do not grab a formula yet — first decide what the paper is actually asking.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
02 / 07
Step B — Write the given in a column
A cell is the smallest living unit. Plants and animals are both made of cells, but the cells are not the same.
Why this step: A column with units stops you mixing cm with m, or minutes with seconds. Markers can also see you started correctly.
03 / 07
Step C — Name the method in words
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.
04 / 07
Working
The nucleus holds the DNA and controls the cell. The cell membrane decides what enters and leaves. Mitochondria release energy by cellular respiration. Ribosomes build proteins. A plant cell also has a cellulose cell wall, chloroplasts for photosynthesis, and one large vacuole that stores water and keeps the cell firm. An animal cell has no wall, no chloroplasts, and only small vacuoles.
Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.
05 / 07
Step G — Sense-check the size
Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.
Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.
06 / 07
Step F — Box the answer with its unit
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.
07 / 07
Step H — What the marker is looking for
On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.
Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.
5. The answer
Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
Copy onto your answer sheet — in this order
Answer: Plant cells have a wall, chloroplasts and a large vacuole. Animal cells do not. Both have a nucleus, membrane and mitochondria.
6. Check it like a marker
Does your answer appear as one of the options? Do the units match what was asked (m, N, J, °)? If you put the number back into the original equation, does it still hold? Estimate: is the size sensible?
7. A trap first-timers fall into
First-timers often grab the first formula they remember, mix units (cm with m, minutes with seconds), or drop a minus sign. Write the formula in words first: “this equals that, because…”