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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

C4 plants have a higher temperature optimum compared to C3 plants, which is a key difference between the two.

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