In photosystem- I, the first electron acceptor is:

Plastocyanin

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An iron-sulphur protein

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Ferredoxin

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Cytochrome

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Solution

The correct options are
B An iron-sulphur protein
C Ferredoxin
PSI passes electron to ferredoxin on stromal side of lumen. Ferredoxin (iron sulfur protein) receives electrons from PSI and reduces to NADP+ to form NADPH. This light reaction is catalyzed by the membrane-bound enzyme NADP reductase. Both B and C are correct answers.

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