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In photosystem-I, the first electron acceptor is

  • Ferredoxin

  • Cytochrome

  • Plastocyanin

  • An iron sulphur protein

Answer

D.

An iron sulphur protein

In photosystem I, the primary electron acceptor is probably a Fe - S protein. The reduced primary acceptor transfers the electrons to secondary electron acceptor (most probably P430). The sequence of electron transfer is as follows:
stack straight P subscript 700 with left parenthesis Chl. straight a to the power of plus right parenthesis below space space rightwards arrow with straight e to the power of minus on top space stack straight A subscript 1 with left parenthesis phylloquinone right parenthesis below space rightwards arrow with straight e to the power of minus on top space space stack straight A subscript 2 with left parenthesis Fe minus straight S space protein right parenthesis below space rightwards arrow with straight e to the power of minus on top space stack straight A subscript 3 with left parenthesis straight P subscript 430 right parenthesis below
The reduced P430 passes its electrons to ferredoxin (Fd) present at outer surface of thylakoid membrane.

In photosystem I, the primary electron acceptor is probably a Fe - S protein. The reduced primary acceptor transfers the electrons to secondary electron acceptor (most probably P430). The sequence of electron transfer is as follows:
stack straight P subscript 700 with left parenthesis Chl. straight a to the power of plus right parenthesis below space space rightwards arrow with straight e to the power of minus on top space stack straight A subscript 1 with left parenthesis phylloquinone right parenthesis below space rightwards arrow with straight e to the power of minus on top space space stack straight A subscript 2 with left parenthesis Fe minus straight S space protein right parenthesis below space rightwards arrow with straight e to the power of minus on top space stack straight A subscript 3 with left parenthesis straight P subscript 430 right parenthesis below
The reduced P430 passes its electrons to ferredoxin (Fd) present at outer surface of thylakoid membrane.