O-LevelBiologyPlant Nutrition5090/11 · May/June 2011 · Q61 Mark

The graph shows the effect of carbon dioxide (CO2) concentration on the rate of photosynthesis. What could be limiting the rate of photosynthesis at points X and Y?

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Acarbon dioxide concentration carbon dioxide concentration

Bcarbon dioxide concentration light intensity

Clight intensity carbon dioxide concentration

Dlight intensity light intensity

✓ Correct answer

B: carbon dioxide concentration light intensity

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Topic: Plant Nutrition, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2011 Paper 1 Variant 1, question 6.

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