During non-cyclic photophosphorylation, when electrons are lost from the reaction centre at PSII , what is…

During non-cyclic photophosphorylation, when electrons are lost from the reaction centre at PSII, what is the source which replaces these electrons?
  1. Oxygen
  2. Water
  3. Carbon dioxide
  4. Light

Solution

Photolysis of water: It is a light-mediated oxidation process associated with PSII characterized by the splitting of a water molecules into electrons, hydrogen ions and oxygen.  The electrons released during photolysis are accepted by P680 of PSII, which has lost its electron due to excitation. The H+ ions released are used to reduce NADP toNADPH+H+  that enters the dark reaction of photosynthesis. The reaction is as follows:

2H2OMn+2, Ca+2, Cl-Sunlinght O2+4H++4e-

Asked in: NEET 2020 (Phase 2)

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