If a chemical makes the thylakoid membrane freely permeable to protons, which of the following will be most directly affected?

(a) splitting of water Your answer
(b) excitation of P₇₀₀ Your answer
(c) ATP synthesis Correct
(d) absorption of light by antenna pigments Your answer

Your answer: Correct answer: (c)

Explanation

Why (c) is correct

If the thylakoid membrane becomes freely permeable to protons, no proton gradient can build up. ATP synthase depends on this gradient, so ATP synthesis is most directly affected.

Why the other options are wrong

(a) · your answer Water splitting depends on PS II, not on the membrane holding protons.
(b) · your answer P700 is excited by light whether or not a proton gradient exists.
(d) · your answer Light absorption by antenna pigments does not need a proton gradient.

NCERT point: Chemiosmosis needs a membrane that keeps protons apart.

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If a chemical makes the thylakoid membrane freely permeable to protons, which of the following will be most directly affected?

Explanation

Why (c) is correct

Why the other options are wrong

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