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The reaction centres of PS I and PS II differ in their

(a) number of electrons they can accept Your answer
(b) pigment, one being chlorophyll a and the other chlorophyll b Your answer
(c) location, one in the stroma and the other in the lumen Your answer
(d) wavelength of maximum absorption, 700 nm and 680 nm Correct

Your answer: Correct answer: (d)

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Explanation

Why (d) is correct

Both reaction centres are chlorophyll a, but they differ in their absorption peak: 700 nm in PS I (P700) and 680 nm in PS II (P680).

Why the other options are wrong

(a) · your answer Their names and roles do not depend on the number of electrons they accept.
(b) · your answer Both are chlorophyll a.
(c) · your answer Both are in the thylakoid membranes.

NCERT point: PS I reaction centre: P700; PS II reaction centre: P680. Both are chlorophyll a.

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