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 asserition and the reasion are true and the reason is a correct explanation of the assertion
B. If both the assertion and reasoni s not a correct ecplanation of the assertio
C. If the assertion is true but the reason is false
D. If both the asseertion and reason are false

Answer

A

Explanation

Small quantity of oxygen is essential for photosynthesis except in some anaerobic bacteria. The inhibition of photosynthesis at high `O_(2)` levels may be due to (i) Oxygen takes part in oxidation of photosynthetic pigments, intermediates and enzymes in the presence of strong light (photo-oxidation), (ii) Oxidation is a strong quencher of excited state of chlorophyll, (iii) it converts RuBP carboxylase to RuBP-oxygen. At a very high decline in all plants. The phenomenon is called Warburg effect (reduction due to photorespiration).