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
E) If the assertion is false but reason is true
Correct Answer: A
Solution :
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) Oxygen is a strong quencher of excited state of chlorophyll, (iii) It converts RuBP carboxylase to RuBP-oxygen. At a very high oxygen content the rate of photosynthesis begins to decline in all plants. The phenomenon is called Warburg effect (reduction due to photorespiration).
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