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Which of the following is present in both PS I and PS II?

(a) the P₇₀₀ reaction centre Your answer
(b) the enzyme NADP reductase Your answer
(c) a reaction centre formed by a chlorophyll a molecule Correct
(d) the water-splitting complex Your answer

Your answer: Correct answer: (c)

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Explanation

Why (c) is correct

Each of the two photosystems has a reaction centre formed by a chlorophyll a molecule.

Why the other options are wrong

(a) · your answer P700 is only in PS I.
(b) · your answer NADP reductase is a separate enzyme on the stroma side, not part of both photosystems.
(d) · your answer The water-splitting complex is linked only to PS II.

NCERT point: Reaction centres: P680 (PS II) and P700 (PS I).

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Which of the following lists the events of the light reaction? When the reaction-centre chlorophyll of PS II absorbs red light of 680 nm, its electrons Light of wavelength beyond 680 nm alone excites