Asserotion: `C_(4)` photosynthetic pathway is more efficient than the `C_(3)` pathway.
Reson : Photorespirationis suppressed in `C_(4)` plants.

Options

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If both the assertion and reason are false

Answer

B

Explanation

The `C_4` plants can absorb `CO_2` even from a much low `CO_2` concentration when the `C_3` plants fail to avail it. Thus the `C_4` plants can perform a high rate of photosynthesis even when the stomata are nearly closed. Photorespiration occurs in most of `C_3` plant.
The `C_4` plants were hardly affected by varying `O_2` concentration.