Assertion : Cyclic pathway of photosynthesis first appeared in some eubacterial species.

Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.

If both assertion and reason are true and reason is correct explanation of assertion.

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If both assertion and reason are true but reason is not the correct explanation of assertion.

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If assertion is true but reason is false.

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If both assertion and reason and false.

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Solution

The correct option is B If both assertion and reason are true but reason is not the correct explanation of assertion.
Cyclic pathway of photosynthesis first appeared in some eubacterial species. It is supposed to be the first evidence of production of ATP in the presence of light. However oxygen started accumulating in the atmosphere after the evolution of non-cyclic pathway of photosynthesis in cyanobacteria.

Therefore, both assertion and reason is true but reason is not the correct explanation of assertion.

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