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(A) During the light-dependent reactions of photosynthesis,water molecules undergo photolysis (ionization) in the presence of light and the oxygen-evo

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Chlorophyll

Vedclass · Answer

(A) During the light-dependent reactions of photosynthesis,water molecules undergo photolysis (ionization) in the presence of light and the oxygen-evolving complex. When water $(H_2O)$ splits,it releases electrons,protons $(H^+)$,and oxygen $(O_2)$. The electrons released from the photolysis of water are immediately accepted by the oxidized form of the reaction center of Photosystem $II$,which is $P_{680}^+$. Therefore,the primary electron acceptor that replaces the electrons lost by chlorophyll $a$ in Photosystem $II$ is the reaction center itself,but in the context of the electron transport chain,the electrons are transferred to the primary electron acceptor of Photosystem $II$,which is pheophytin. However,among the given options,the question refers to the immediate electron donor/acceptor relationship in the context of the water-splitting complex. Since the question asks for the primary electron acceptor during the ionization of water,it refers to the reaction center $P_{680}$ which gets reduced after accepting electrons from water. Given the standard options provided,$P_{680}$ (Chlorophyll $a$) is the correct biological entity.

The primary electron acceptor during the ionization of water is:

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