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Which one of the following represents photophosphorylation?

(a) ADP + inorganic phosphate + light energy → ATP Correct
(b) ADP + inorganic phosphate → ATP (no light) Your answer
(c) AMP + inorganic phosphate + light energy → ATP Your answer
(d) ADP + AMP + light energy → ATP Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

Photophosphorylation is the synthesis of ATP from ADP and inorganic phosphate using light energy, in the chloroplast.

Why the other options are wrong

(b) · your answer ATP formation without light is substrate-level or oxidative phosphorylation, not photophosphorylation.
(c) · your answer ATP is made from ADP, not AMP, in photophosphorylation.
(d) · your answer ATP is made by adding a phosphate to ADP; AMP is not the other substrate.

NCERT point: Light energy drives electron transport; the proton gradient formed then drives ATP synthase.

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