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

(a) Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate.

(b) C3 plants respond to higher temperature with enhanced photosynthesis while C4 plants have much lower temperature optimum.

(c) Tomato is a greenhouse crop which can be grown in CO2 ­enriched atmosphere for higher yield.

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

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Ans : (b) C3 plants respond to higher temperature with enhanced photosynthesis while C4 plants have  much lower temperature optimum.

Explanation :

C plants have RuBisCo enzyme which gets activated on higher carbon dioxide concentration.C4 plants have PEP as major CO2 acceptor. Photosynthetic activity is mainly affected by enzymes rather than temperatures. High temperature leads to destruction of photosynthetic pigments.

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