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In the Z scheme, the two points where electrons are raised to a higher energy level by light are

(a) PS II and PS I Correct
(b) cytochrome b₆f and ATP synthase Your answer
(c) water and NADP⁺ Your answer
(d) plastoquinone and plastocyanin Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

In the Z scheme, light raises electrons to a higher energy level twice: at PS II and at PS I.

Why the other options are wrong

(b) · your answer Cytochrome b₆f and ATP synthase do not absorb light.
(c) · your answer Water is the donor and NADP⁺ the acceptor; neither absorbs light.
(d) · your answer Plastoquinone and plastocyanin are carriers; they do not absorb light.

NCERT point: The two energy lifts give the electron path its Z shape.

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