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The photosystem directly concerned with the reduction of NADP⁺ is

(a) both PS I and PS II equally Your answer
(b) PS I Correct
(c) PS II Your answer
(d) neither PS I nor PS II Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

Electrons from PS I pass to ferredoxin and then reduce NADP⁺ to NADPH. So PS I is directly concerned with NADP⁺ reduction.

Why the other options are wrong

(a) · your answer PS II supplies electrons to PS I, but only PS I passes them to NADP⁺.
(c) · your answer PS II gives electrons to the transport chain, not directly to NADP⁺.
(d) · your answer PS I does reduce NADP⁺.

NCERT point: Z scheme: H₂O → PS II → ETC → PS I → NADP⁺.

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