O-LevelBiologyPlant Nutrition5090/11 · May/June 2023 · Q71 Mark

The graph shows how the rate of photosynthesis in a plant varies with light intensity. Which statements are correct? 1 Light intensity is the only limiting factor in photosynthesis. 2 Between points P and Q on the graph, light intensity is the factor that is limiting the rate of photosynthesis. 3 Between Q and R, another factor is limiting the rate of photosynthesis.

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A1 and 2

B1 only

C2 and 3

D3 only

✓ Correct answer

C: 2 and 3

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Topic: Plant Nutrition, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2023 Paper 1 Variant 1, question 7.

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