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Electrons from the PS I acceptor reduce NADP⁺ to NADPH + H⁺. The protons needed for this come from

(a) the Calvin cycle Your answer
(b) the outer membrane Your answer
(c) the lumen Your answer
(d) the stroma Correct

Your answer: Correct answer: (d)

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Explanation

Why (d) is correct

NADP⁺ is reduced on the stroma side, so the protons it uses come from the stroma. This also adds to the proton gradient.

Why the other options are wrong

(a) · your answer The Calvin cycle uses NADPH; it does not supply protons for its formation.
(b) · your answer The outer membrane does not supply protons.
(c) · your answer The lumen protons are on the other side of the membrane.

NCERT point: NADP reductase faces the stroma.

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