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(D) In the process of non-cyclic photophosphorylation ($Z$-scheme),light energy is absorbed by both Photosystem-$II$ $(PSII)$ and Photosystem-$I$ $(PS

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Non-cyclic photophosphorylation

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(D) In the process of non-cyclic photophosphorylation ($Z$-scheme),light energy is absorbed by both Photosystem-$II$ $(PSII)$ and Photosystem-$I$ $(PSI)$.When $PSII$ absorbs light,it becomes excited and loses electrons,which are then transferred through an electron transport chain.The oxidation of water (photolysis) occurs at $PSII$,which generates a strong oxidant $(P680^+)$ capable of splitting water molecules.Simultaneously,the electrons are transferred to $NADP^+$,which is reduced to $NADPH$. $NADPH$ acts as a weak reductant in the Calvin cycle.Therefore,non-cyclic photophosphorylation is the process that generates both a strong oxidant and a weak reductant.

Which photochemical reaction generates a strong oxidant and a weak reductant?

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