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Question
Assertion : Higher concentration of O2 is inhibitory to photosynthesis. Reason: This inhibition is due to Warburg effect.
Assertion : Higher concentration of O2 is inhibitory to photosynthesis. Reason: This inhibition is due to Warburg effect.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Small quantity of oxygen is essential for photosynthesis except in some
anaerobic bacteria. The inhibition of photosynthesis at high O2
levels may be due to:
(i) Oxygen takes part in oxidation of
photosynthetic pigments intermediate and enzymes in the presence of
strong light
(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's effect.
So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.
Small quantity of oxygen is essential for photosynthesis except in some
anaerobic bacteria. The inhibition of photosynthesis at high O2
levels may be due to:
(i) Oxygen takes part in oxidation of
photosynthetic pigments intermediate and enzymes in the presence of
strong light
(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's effect.
So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.
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