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NADPH is formed on which side of the thylakoid membrane?

(a) the stroma side Correct
(b) the intermembrane space Your answer
(c) the lumen side Your answer
(d) the outer chloroplast membrane Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

NADP reductase is on the stroma side of the thylakoid membrane, so NADPH is formed in the stroma, where it is used in the Calvin cycle.

Why the other options are wrong

(b) · your answer The intermembrane space is between the envelope membranes, not where NADPH forms.
(c) · your answer The lumen is where protons collect; NADPH forms on the other side.
(d) · your answer The outer membrane is not involved.

NCERT point: Forming NADPH removes protons from the stroma, which adds to the proton gradient.

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