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PS I and PS II are named

(a) according to the wavelength they absorb Your answer
(b) in the order of their discovery, not the order in which they act Correct
(c) according to the order in which they act in the light reaction Your answer
(d) according to their location in the stroma Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

PS I and PS II are named in the order of their discovery, not in the order in which they act. PS II actually acts first in the Z scheme.

Why the other options are wrong

(a) · your answer The names do not come from the wavelengths absorbed.
(c) · your answer PS II acts before PS I, so the numbers do not follow the order of action.
(d) · your answer Both photosystems are in the thylakoid membranes, not the stroma.

NCERT point: Z scheme: water → PS II → ETC → PS I → NADP⁺.

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