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The excitation of the PS I reaction centre is caused by light of wavelength around

(a) 700 nm Correct
(b) 680 nm Your answer
(c) 450 nm Your answer
(d) 550 nm Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

The PS I reaction centre (P700) absorbs maximally at about 700 nm.

Why the other options are wrong

(b) · your answer 680 nm is the peak of PS II (P680).
(c) · your answer 450 nm is blue light, absorbed by antenna pigments, not the specific peak of P700.
(d) · your answer 550 nm is green light, absorbed poorly.

NCERT point: PS I = P700; PS II = P680.

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