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

Options

A. a) Light saturation for `CO_(2)` fixation occurs at 10% of full sunlight .
B. b) Increasing atmospheric `CO_(2)` concentration up to 0.05% can enhance `CO_(2)` fixation rate
C. c) `C_(3)` plants respond to higher temperatures with enhanced photosynthesis while `C_(4)` plants have much lower temperature optimum.
D. d) Tomato is a greenhouse crop which can be grown in `CO_(2)` enriched atmosphere for higher yield.

Explanation

In `C_3` plants photosynthesis is decreased at higher temperature due to increased photorespiration.
`C_(4)`plants have higher temperature optimum because of the presence of pyruvate phosphate dikinase enzyme, which is sensitive to low temperature.