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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Anup Padwal
The ultimate source is water. The source of electrons for photosynthesis in green plants and cyanobacteria is water. Two water molecules are oxidized by four successive charge-separation reactions by photosystem II to yield a molecule of diatomic oxygen and four hydrogen ions. water is the source of electrons and their final destination is NADP+ to make NADPH.