Biology · May / June 2020 · Paper 11 · Question 7
5090Photosynthesis
The graph shows the rate of photosynthesis in a plant in full sunlight at two different temperatures and different concentrations of carbon dioxide. [graph: rate of photosynthesis / arbitrary units vs percentage concentration of carbon dioxide, curves for 30 °C and 20 °C] At normal atmospheric carbon dioxide concentrations, what limits the rate of photosynthesis?
- Acarbon dioxide concentration
- Blight intensity
- Ctemperature
- Dwater availability
As printed in the paper
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Correct answer: A. carbon dioxide concentration
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