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

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

  • Increasing atmospheric CO2¬†concentration upto 0.05% can enhance CO2 fixation rate

  • C3 plants responds to higher temperatures with enhanced photosynthesis while C4 plants have much lower temperature optimum

  • Tomato is a greenhouse crop which can be grown in CO2- enriched atmosphere for higher yield

Answer

C.

C3 plants responds to higher temperatures with enhanced photosynthesis while C4 plants have much lower temperature optimum

In C3 plants photosynthesis is decreased at higher temperature due to increased photorespiration. C4 plants have higher temperature optimum because of the presence of pyruvate phosphate dikinase enzyme, which is sensitive to low temperature.

In C3 plants photosynthesis is decreased at higher temperature due to increased photorespiration. C4 plants have higher temperature optimum because of the presence of pyruvate phosphate dikinase enzyme, which is sensitive to low temperature.