O-LevelBiologyPlant Nutrition5090/11 · May/June 2010 · Q61 Mark

The graph shows the rate of photosynthesis of a plant at increasing light intensities at two different carbon dioxide concentrations. The temperature is kept constant. What may be limiting the rate of photosynthesis at X, Y and Z? [Figure 6.1]

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Acarbon dioxide, light intensity, carbon dioxide

Bcarbon dioxide, light intensity, light intensity

Clight intensity, carbon dioxide, carbon dioxide

Dlight intensity, carbon dioxide, light intensity

✓ Correct answer

C: light intensity, carbon dioxide, carbon dioxide

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Topic: Plant Nutrition, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2010 Paper 1 Variant 1, question 6.

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