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

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C₃plants respond to higher temperatures with enhanced photosynthesis while C₄plants have much lower temperature optimium.

Atmospheric CO₂concentration up to 0.05% can enhance the CO₂ fixation rate.

Light saturation for CO₂ fixation occurs at 10% of full sunlight.

Tomato is a green house crop which can be grown in a CO₂enriched atmosphere for a higher yield.

answer is B.

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Detailed Solution

C₃ plants respond well to lower temperature optima and C₄ plants respond relatively well to higher temperature optima.
(1) Increasing atomospheric CO₂concentration up to 0.05% can enhance CO₂ fixation rate more in C₃ plants than
in C₄ plants.
(3) Productivity of tomato can be increased by growing it in CO₂ enriched greenhouses.
(4) At 10% of full sunlight, light saturation for CO₂ fixation occurs.

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