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With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

1. Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate
2. C3 plants respond to higher temperatures with enhanced photosynthesis while C4 plants have much lower temperature optimum
3. Tomato is a greenhouse crop which can be grown in CO2-enriched atmosphere for higher yield
4. Light saturation for CO2 fixation occurs at 10% of full sunlight

Correct answer: C3 plants respond to higher temperatures with enhanced photosynthesis while C4 plants have much lower temperature optimum

Solution

The incorrect statement is the one that swaps the temperature preferences of C3 and C4 plants. C4 plants generally perform better at higher temperatures, while C3 plants are less efficient there and do not have the higher-temperature advantage described.

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