Assertion :Cyclic pathway of photosynthesis first appeared in some eubacterial sps. Reason: $O_{2}$ started accumulating in the atmospheres after the non-cyclic pathway of photosynthesis.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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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
Cyclic pathway of photosynthesis first appeared in some eubacterial species like purple bacteria and green sulphur bacteria as cyclic phosphorylation occurs due to P $_{700}$ which is a primitive photosystem.
Oxygen is evolved as the by-product of the process of the non-cyclic phosphorylation, which is predominant in the green plants.
Both the statements are correct but the reason is not the correct explanation for the assertion.
Thus, the correct answer is option B.

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