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Simultaneously, the pigment molecules of PS-I complex absorb solar radiation and transfer their absorbed electronic excitation (energy) to PS-I reaction centre - P700. P700 gets excited and exudes an electron, which goes to reduce an electrons acceptor A. The oxidised reaction centre of PS-I takes electron from plastocyanin and comes to ground state.
The electron emitted from the P700 is accepted by an unknown acceptor A which transfers its electron to ferredoxin an iron containing protein positioned at the outer surface of thylakoid membrane. The reduced ferredoxin donates its electrons to NADP+ (Nicotinamide Adenine Dinucleotide Phosphate). The NADP+ takes electrons from ferredoxin, protons from the medium and gets reduced to NADPH2 in presence of enzymes, Ferredoxin - NADP - reductase.
