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Photosynthesis in Higher Plants question

2023 · Q32
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Photosynthesis in Higher Plants question

2023 · Q32

NEETBiologyPhotosynthesis in Higher PlantsMCQ+4 / −1

Which out of the following statements is incorrect?

  1. A
    Grana lamellae have both PS I and PS II
  2. B
    Cyclic photophosphorylation involves both PS I and PS II
  3. C
    Both ATP and NADPH + H+^++ are synthesised during non-cyclic photophosphorylation.
  4. D
    Stroma lamellae lack PS II and NADP reductase
View written solutionFree

Correct answer: B

Photosystems I and II are involved in the light-dependent reactions of photosynthesis, occurring in the thylakoid membranes of chloroplasts.

Option A : Grana lamellae (the stacks of thylakoid membranes in chloroplasts) do indeed have both Photosystem I (PS I) and Photosystem II (PS II).

Option C : During non-cyclic photophosphorylation, both ATP (energy currency of the cell) and NADPH (which carries electrons for the light-independent reactions, or the Calvin cycle) are produced. This statement is correct.

Option D : Stroma lamellae (parts of the thylakoid system that interconnect grana) lack PS II and NADP reductase, which are instead located in the grana lamellae. This statement is also correct.

Option B : Cyclic photophosphorylation involves only PS I, not PS II. This is because the primary purpose of cyclic photophosphorylation is to produce additional ATP without producing NADPH. Therefore, this statement is incorrect.

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