O-LevelBiologyPlant Nutrition5090/11 · May/June 2020 · Q71 Mark

The graph shows the rate of photosynthesis in a plant in full sunlight at two different temperatures and different concentrations of carbon dioxide. [Figure 7.1]. At normal atmospheric carbon dioxide concentrations, what limits the rate of photosynthesis?

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Acarbon dioxide concentration

Blight intensity

Ctemperature

Dwater availability

✓ Correct answer

A: carbon dioxide concentration

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Topic: Plant Nutrition, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2020 Paper 1 Variant 1, question 7.

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