Assertion : The concentration of `O_(2)` in atmosphre is inhibitary to photosynthesis.
Reason : Oxygen inhibitory effect is due to Warburg effect.

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

Oxygen has been shown to inhibit photosynthesis in `C_3` plant that exhibits photorespiration. Oxygen is inhibitory because it favours rapid respiration which utilizes common intermediates and it competes with: it destroys the excited state of chlorophyll.
Warburg in 1992 observed that presence `O_2` in the atmosphere inhibits photosynthesis in green algae and was termed as Warburg effect.