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gcse · biology · Pearson Edexcel · All papers
Releases 1 August 2026
Ultimate and Lifetime users can create one saved set of 4 extended-response questions for this topic and mark answers with examiner-style feedback.
Examiner-style long-answer practice with automatic marking, improvement advice and ProofCoach tracking.
hard
Pondweed photosynthesis practical
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Pondweed bubble count
| bubbles produced (bubbles) | time (s) |
|---|---|
| 36 | 120 |
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Photosynthesis rate at different light intensities
| light intensity (lux) | oxygen produced (cm3 min-1) |
|---|---|
| 200 | 1.2 |
| 600 | 3.6 |
| 1000 | 4 |
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Bubble-count repeats
| lamp distance (cm) | repeat 1 (bubbles min-1) | repeat 2 (bubbles min-1) | repeat 3 (bubbles min-1) |
|---|---|---|---|
| 20 | 42 | 39 | 41 |
| 40 | 20 | 24 | 19 |
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Paying students get 20 stored MCQs per generation session and 2sessions each month. Your set is saved here so you can reset and retake it without using another allowance. If the bank is running low, replenishment happens in the background.