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Q. Ferredoxin is a constituent of

AIPMTAIPMT 1991Photosynthesis in Higher Plants

Solution:

In photosystem-I, the ejected electron is trapped by FRS (ferrodoxin reducing substance) which is an unknown oxidation - reduction system. The electron is now transferred to a non-heme iron protein called ferrodoxin (Fd) from which electron is transferred to NADP+ intermediate protein electron carrier ferrodoxin-NADP reductase. So that NADP+ is reduced to NADPH + H+.