O-LevelBiologyPlant Nutrition5090/11 · Oct/Nov 2010 · Q61 Mark

The graph shows the effect of light intensity on the rate of photosynthesis. [Graph] Which statement could explain what is happening at higher light intensities?

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AAll the available chloroplasts are fully occupied in light absorption.

BHigh light intensities increase the temperature above the optimum for photosynthesis.

CThe chlorophyll in the chloroplasts has been damaged.

DThe products of photosynthesis accumulate and inhibit photosynthesis.

✓ Correct answer

A: All the available chloroplasts are fully occupied in light absorption.

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

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