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In photosystem-I the first electron acceptor is

1. Cytochrome
2. Plastocyanin
3. An iron-sulphur protein
4. Ferredoxin

Correct answer: An iron-sulphur protein

Solution

In photosystem I, the primary electron acceptor is an iron-sulphur protein, which receives the excited electron from the reaction center chlorophyll. Ferredoxin acts later as a downstream electron carrier, not the first acceptor.

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