Assertion :Dark reaction is purely enzymatic reaction. Reason: It occurs only in presence of light.

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

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Both Assertion and Reason are correct.

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Assertion is incorrect but Reason is correct

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Assertion is correct but the Reason is incorrect.

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Solution

The correct option is D Assertion is correct but the Reason is incorrect.
During photosynthesis, assimilatory power ATP and $N A D P H_{2}$ are produced which require light. This reaction is called light reaction or Hill's reaction. Assimilatory powers are required for the reduction of $C O_{2}$ . This reaction is enzymatic and independent of light. It is called dark reaction which takes place in the stroma of the chloroplast. So, the dark reaction is independent of the presence of light.

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