O-LevelBiologyPlant Nutrition5090/11 · May/June 2016 · Q71 Mark

The graph shows how the rate of photosynthesis of a plant varies with light intensity at two different carbon dioxide concentrations. The temperature is kept constant at 20°C. [Figure 7.1] Which factor is limiting the rate of photosynthesis at point X?

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Aavailability of chlorophyll

Bavailability of water

Cconcentration of carbon dioxide

Dintensity of light

✓ Correct answer

C: concentration of carbon dioxide

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Topic: Plant Nutrition, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2016 Paper 1 Variant 1, question 7.

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