PSLE Learner’s Guide · Volume 0879
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Chlorophyll in green parts traps light energy used in photosynthesis; it is not the food, a raw material or the source of carbon dioxide.
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This guide uses original Primary 6 practice and does not predict a live question. Consult the SEAB PSLE formats examined in 2026 page for official information.
Open the full chapter index
- 1. Name chlorophyll’s role precisely
- 2. Keep energy separate from matter
- 3. Locate the main food-making region
- 4. Track the inputs and outputs
- 5. Do not confuse chlorophyll with chloroplast
- 6. Interpret starch evidence carefully
- 7. Control a variegated-leaf comparison
- 8. Control examination explanations
- 9. Worked examples
- 10. Independent practice
- 11. Delayed transfer
- 12. Family guidance and FAQs
CHAPTER 1 OF 12 · Back to contents
1. Name chlorophyll’s role precisely
Chlorophyll is a green pigment in green plant parts. It traps light energy that is used during photosynthesis. It is not the food made by the plant.
Build the explanation by naming chlorophyll in green plant parts and light energy and the raw materials. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking food production by photosynthesis and returning to evidence limits and controlled leaf tests. State why the tempting alternative is too strong, incomplete or about a different stage.
- Check chlorophyll in green plant parts.
- Check light energy and the raw materials.
- Check food production by photosynthesis.
- Check evidence limits and controlled leaf tests.
CHAPTER 2 OF 12 · Back to contents
2. Keep energy separate from matter
Light supplies energy, while carbon dioxide and water provide matter used to make food. Saying that light is a raw material or that chlorophyll turns into food mixes different roles.
Build the explanation by naming chlorophyll in green plant parts and light energy and the raw materials. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking food production by photosynthesis and returning to evidence limits and controlled leaf tests. State why the tempting alternative is too strong, incomplete or about a different stage.
CHAPTER 3 OF 12 · Back to contents
3. Locate the main food-making region
Leaves are well suited for photosynthesis because many leaf cells contain chlorophyll and leaves can receive light and exchange gases. Other green plant parts may also photosynthesise.
Build the explanation by naming chlorophyll in green plant parts and light energy and the raw materials. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking food production by photosynthesis and returning to evidence limits and controlled leaf tests. State why the tempting alternative is too strong, incomplete or about a different stage.
CHAPTER 4 OF 12 · Back to contents
4. Track the inputs and outputs
During photosynthesis, a green plant uses carbon dioxide and water in the presence of light and chlorophyll to make food, and oxygen is released. Each term has a distinct role.
Build the explanation by naming chlorophyll in green plant parts and light energy and the raw materials. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking food production by photosynthesis and returning to evidence limits and controlled leaf tests. State why the tempting alternative is too strong, incomplete or about a different stage.
CHAPTER 5 OF 12 · Back to contents
5. Do not confuse chlorophyll with chloroplast
Chlorophyll is the light-trapping pigment. It is found within cell structures called chloroplasts, but the two names do not refer to the same thing.
Build the explanation by naming chlorophyll in green plant parts and light energy and the raw materials. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking food production by photosynthesis and returning to evidence limits and controlled leaf tests. State why the tempting alternative is too strong, incomplete or about a different stage.
CHAPTER 6 OF 12 · Back to contents
6. Interpret starch evidence carefully
A leaf test for starch can provide evidence that food was made and stored or converted in the tested region. The result should be linked to controlled light and chlorophyll conditions rather than assumed from colour alone.
Build the explanation by naming chlorophyll in green plant parts and light energy and the raw materials. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking food production by photosynthesis and returning to evidence limits and controlled leaf tests. State why the tempting alternative is too strong, incomplete or about a different stage.
CHAPTER 7 OF 12 · Back to contents
7. Control a variegated-leaf comparison
In a leaf with green and non-green regions, keep light exposure and other conditions common. Compare starch results in the regions to investigate the role of chlorophyll.
Build the explanation by naming chlorophyll in green plant parts and light energy and the raw materials. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking food production by photosynthesis and returning to evidence limits and controlled leaf tests. State why the tempting alternative is too strong, incomplete or about a different stage.
CHAPTER 8 OF 12 · Back to contents
8. Control examination explanations
Name the pigment, energy source, raw materials and process, then state only the observation supported by the setup. Do not claim that one result proves every requirement unless the comparison isolates it.
Build the explanation by naming chlorophyll in green plant parts and light energy and the raw materials. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking food production by photosynthesis and returning to evidence limits and controlled leaf tests. State why the tempting alternative is too strong, incomplete or about a different stage.
CHAPTER 9 OF 12 · Back to contents
9. Worked examples
Worked case 1: What does chlorophyll trap?
Controlled answer. Light energy. The trapped energy is used in photosynthesis.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Separate the energy source from raw materials. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Light energy” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck chlorophyll in green plant parts, light energy and the raw materials, food production by photosynthesis, evidence limits and controlled leaf tests. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 2: Is chlorophyll the food made by a plant?
Controlled answer. No. Chlorophyll is a pigment involved in trapping light energy.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Name the process that makes food. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “No” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck chlorophyll in green plant parts, light energy and the raw materials, food production by photosynthesis, evidence limits and controlled leaf tests. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 3: Is light a raw material that becomes food?
Controlled answer. No. Light supplies energy, while carbon dioxide and water supply matter.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Classify each input by role. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “No” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck chlorophyll in green plant parts, light energy and the raw materials, food production by photosynthesis, evidence limits and controlled leaf tests. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 4: Which gas is used during photosynthesis?
Controlled answer. Carbon dioxide. It is a raw material for food making.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Name the gas released. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Carbon dioxide” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck chlorophyll in green plant parts, light energy and the raw materials, food production by photosynthesis, evidence limits and controlled leaf tests. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 5: Which liquid raw material is used?
Controlled answer. Water. Water is taken up by roots and transported to green parts.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Trace its route to a leaf. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Water” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck chlorophyll in green plant parts, light energy and the raw materials, food production by photosynthesis, evidence limits and controlled leaf tests. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 6: Which gas is released during photosynthesis?
Controlled answer. Oxygen. Oxygen is a product released by the plant.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Avoid calling it the plant’s food. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Oxygen” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck chlorophyll in green plant parts, light energy and the raw materials, food production by photosynthesis, evidence limits and controlled leaf tests. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 7: Repair: chlorophyll changes into food.
Controlled answer. Chlorophyll traps light energy used to make food. The pigment has a role in the process but is not consumed as the food product.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. State the raw materials. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Chlorophyll traps light energy used to make food” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck chlorophyll in green plant parts, light energy and the raw materials, food production by photosynthesis, evidence limits and controlled leaf tests. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 8: Repair: sunlight supplies carbon dioxide to the leaf.
Controlled answer. Air supplies carbon dioxide; sunlight supplies light energy. The sources and roles are different.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Identify the gas-entry route at a suitable level. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Air supplies carbon dioxide; sunlight supplies light energy” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck chlorophyll in green plant parts, light energy and the raw materials, food production by photosynthesis, evidence limits and controlled leaf tests. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 9: What is the difference between chlorophyll and a chloroplast?
Controlled answer. Chlorophyll is a pigment found within chloroplasts. One is a substance and the other a cell structure.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Use both terms accurately in one sentence. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Chlorophyll is a pigment found within chloroplasts” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck chlorophyll in green plant parts, light energy and the raw materials, food production by photosynthesis, evidence limits and controlled leaf tests. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 10: Can a non-green root be assumed to photosynthesise strongly?
Controlled answer. No. It usually lacks chlorophyll and receives little light.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Contrast with a green leaf. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “No” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck chlorophyll in green plant parts, light energy and the raw materials, food production by photosynthesis, evidence limits and controlled leaf tests. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 11: A green leaf is kept in darkness. Is green colour alone enough for photosynthesis?
Controlled answer. No. Light is also required.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Predict a controlled starch-test result. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “No” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck chlorophyll in green plant parts, light energy and the raw materials, food production by photosynthesis, evidence limits and controlled leaf tests. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 12: Why destarch a plant before a light experiment?
Controlled answer. To reduce previously stored starch that could confuse the result. The later starch evidence should be linked more clearly to the treatment period.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Name a control leaf region. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “To reduce previously stored starch that could confuse the result” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck chlorophyll in green plant parts, light energy and the raw materials, food production by photosynthesis, evidence limits and controlled leaf tests. Decide whether the evidence proves the conclusion or only supports a limited statement.
CHAPTER 10 OF 12 · Back to contents
10. Independent practice
Practice 1: In a variegated leaf, which regions contain chlorophyll?
Explained answer. The green regions. Green colour indicates chlorophyll is present there.
Delayed transfer. Compare starch results after suitable preparation. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
Practice 2: If only green illuminated regions test positive for starch, what does the evidence support?
Explained answer. Chlorophyll and light are associated with food making under the test conditions. The controlled comparison isolates those conditions more carefully.
Delayed transfer. Avoid claiming that colour itself is food. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
Practice 3: Does one starch test directly measure oxygen release?
Explained answer. No. It provides evidence about starch, not a direct measurement of oxygen.
Delayed transfer. Choose evidence suited to the claim. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
Practice 4: Why must similar regions receive the same water and carbon dioxide conditions?
Explained answer. To keep those factors from explaining the difference. A fair comparison changes the intended factor.
Delayed transfer. List the controlled variables. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
Practice 5: What is the nearest misconception?
Explained answer. Treating chlorophyll, chloroplast, light energy and food as interchangeable. They are a pigment, a structure, an energy source and a product category.
Delayed transfer. Build a four-column role table. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
Practice 6: Can a green stem photosynthesise?
Explained answer. It may if it contains chlorophyll and receives light. Photosynthesis is not restricted by the word leaf alone.
Delayed transfer. State the required conditions cautiously. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
Practice 7: How should a result be written?
Explained answer. Name the tested region, observed starch result and the condition that differed. Evidence should be tied to the actual comparison.
Delayed transfer. Write a limited conclusion. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
Practice 8: State the full method.
Explained answer. Identify chlorophyll as the light-trapping pigment, keep energy separate from raw materials, and use controlled evidence to connect green illuminated tissue with food making. Do not confuse pigment, cell structure, food and gas exchange.
Delayed transfer. Explain a new leaf experiment. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
CHAPTER 11 OF 12 · Back to contents
11. Delayed transfer
On day one, solve clear examples. On day three, mix examples, near-nonexamples and incomplete evidence. On day seven, solve without headings or a word bank. Delay reveals whether the method can be reconstructed independently.
Keep an error log for the first failed stage: reading, representation, rule, execution or checking. The earliest failure identifies the repair.
Interleave this skill with neighbouring ideas that share vocabulary. Classify each item only after naming the distinguishing condition.
In timed work, mark the relationship, apply the rule, write the conclusion and audit one condition. If checking changes the answer, record the overlooked feature.
Create a teach-back card with a near-nonexample on the front and the repaired mechanism on the back. Explain why the tempting answer fails.
Finish with one basic example, one boundary case and one transfer case. Supply explanations that a classmate can verify.
For a second delayed test, reverse the direction: start from a conclusion and invent evidence that would justify it, then evidence that would be insufficient. This exposes the boundary between relevance and proof.
CHAPTER 12 OF 12 · Back to contents
12. Family guidance and FAQs
Guidance for parents and tutors
Ask for the decisive condition before confirming the answer. Use prompts such as “What exactly happened?”, “Which stage or meaning is this?” and “What would prove it?”
Fade support from labelled examples to mixed questions and delayed open response. Independent retrieval after time and topic change is the target.
Praise precise claim control. Narrowing an answer when evidence is incomplete is scientific and academic strength.
Frequently asked questions
Should I memorise the rule?
Memorise the compact rule, then practise examples and near-nonexamples so the conditions remain visible.
What if two answers seem possible?
Return to the exact relationship and choose the option satisfying every stated condition without adding facts.
Why delay practice?
Immediate repetition may depend on the recent explanation; delay tests reconstruction.
How should an error be corrected?
Name the first failed stage and practise it with a changed example.
When is the skill ready?
When the learner can explain, apply and transfer it after a delay.
What is the final audit?
Check relationship, mechanism, claim strength and whole-question fit.
Next routes
Continue at the Science learning hub or return to the series directory.