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The reaction centre of PS II has an absorption maximum at

(a) 680 nm Correct
(b) 700 nm Your answer
(c) 780 nm Your answer
(d) 660 nm Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

The reaction-centre chlorophyll a of PS II absorbs maximally at 680 nm, so it is called P680. The reaction centre of PS I absorbs at 700 nm (P700).

Why the other options are wrong

(b) · your answer 700 nm is the absorption peak of the PS I reaction centre (P700).
(c) · your answer 780 nm is beyond the red end of the visible range used in photosynthesis.
(d) · your answer 660 nm is not the reaction-centre peak of either photosystem.

NCERT point: PS I = P700; PS II = P680. Each has a reaction centre of chlorophyll a surrounded by light-harvesting complexes.

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