Home Biology Photosynthesis in Higher Plants Skill Builder Immediately after light becomes unavailable,…
Biology Photosynthesis in Higher Plants Skill Builder Single Correct MCQ
Published on: August 14, 2026

Immediately after light becomes unavailable, the biosynthetic process of photosynthesis continues for some time, and then stops. If then, light is made available, the synthesis start again. Which of the following cannot be the relevant conclusion, based on the statement, given above?

A
Being physical and light driven, electron transport reactions are comparatively fast.
B
Membrane or lamellae of the grana have both PSI and PSII, the stroma lamellae membranes lack PSII as well as NADP reductase enzyme.
C
Biosynthetic phase of photosynthesis does not directly depend on the presence of light but is dependent on the products of the light reaction
D
Consumption of ATP and is comparatively slow process.

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The products of light reaction are ATP, NADPH and . Of these diffuses out of the chloroplast while ATP and NADPH are used to drive the processes leading to the synthesis of food, more accurately, sugars. This is the biosynthetic phase of photosynthesis. This process does not directly depend on the presence of light but is dependent on the products of the light reaction, i.e., ATP and NADPH, besides and . This can be verified by the following observation that immediately after light becomes unavailable, the biosynthetic process continues for some time, and then stops. If then, light is made available, the synthesis starts again.

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