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P₆₈₀ is the reaction centre of

(a) PS I Your answer
(b) cytochrome b₆f Your answer
(c) ATP synthase Your answer
(d) PS II Correct

Your answer: Correct answer: (d)

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Explanation

Why (d) is correct

P680 is the reaction-centre chlorophyll a of PS II, which absorbs maximally at 680 nm.

Why the other options are wrong

(a) · your answer The reaction centre of PS I is P700.
(b) · your answer The cytochrome b₆f complex is an electron carrier, not a photosystem with a reaction centre.
(c) · your answer ATP synthase makes ATP; it has no light-absorbing reaction centre.

NCERT point: PS II (P680) splits water; PS I (P700) passes electrons to NADP⁺.

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