Which of the following statement is correct for plants at low light conditions?

Moderate

A

With increase in CO₂ concentration, C₃ plant shows increase in photosynthetic rate.
B

Maize plant shows increase in rate of photosynthesis with rise in ${CO}_{2}$ concentration.
C

Tomato and maize both show increase in rate of photosynthesis with rise in ${CO}_{2}$ concentration.
D

Tomato and maize do not show increase in rate of photosynthesis at high atmospheric ${CO}_{2}$ concentration.

Solution

The $C_{3}$ and $C_{4}$ plants respond differently to ${CO}_{2}$ concentrations. At low light conditions neither group responds to high ${CO}_{2}$ conditions. At high light intensities, both $C_{3}$ and $C_{4}$ plants show increase in the rates of photosynthesis as high ${CO}_{2}$ is provided. Tomato is a C₃ plant and Maize is C₄ plant.

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