(D) The biosynthetic phase (dark reaction) of photosynthesis does not depend directly on light; rather,it depends on the products of the light reactio

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Both Assertion and Reason are incorrect.

(D) The biosynthetic phase (dark reaction) of photosynthesis does not depend directly on light; rather,it depends on the products of the light reaction ($ATP$ and $NADPH$).Both $ATP$ and $NADPH$ are essential for the assimilation of $CO_2$ into carbohydrates during the Calvin cycle.Therefore,both Assertion $(A)$ and Reason $(R)$ are incorrect.

Class 11 Biology Photosynthesis in Higher Plants C3 and Dark reaction

Medium

$A$: Biosynthetic phase of photosynthesis depends directly on the presence of light.
$R$: Both $ATP$ and $NADPH$ are not essential for the assimilation of $CO_2$ to carbohydrates.

A
Assertion and Reason both are correct and Reason is the correct explanation of Assertion.
B
Assertion and Reason both are correct but Reason is not the correct explanation of Assertion.
C
Assertion is correct,but Reason is incorrect.
D
Both Assertion and Reason are incorrect.