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The correct sequence of electron flow in non-cyclic photophosphorylation is

(a) water → PS II → electron transport chain → PS I → NADP⁺ Correct
(b) PS I → water → PS II → NADP⁺ Your answer
(c) NADP⁺ → PS I → PS II → water Your answer
(d) water → PS I → cytochromes → PS II → NADP⁺ Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

In non-cyclic flow, electrons move from water to PS II, through the electron transport chain to PS I, and finally to NADP⁺.

Why the other options are wrong

(b) · your answer Water gives electrons to PS II, not PS I.
(c) · your answer This is the reverse of the true path.
(d) · your answer Water supplies PS II, not PS I.

NCERT point: This path is the Z scheme.

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