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  4. During non-cyclic photophosphorylation, electrons are continuously lost from the reaction centre of PS II. Which source is used to replace these electrons?

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Q. During non-cyclic photophosphorylation, electrons are continuously lost from the reaction centre of $PS II$. Which source is used to replace these electrons?

Photosynthesis in Higher Plants

Solution:

Non-cydic photophosphorylation is the normal process of photophosphorylation in which the electron expelled by the excited photocentre does not return to it. Non- cydic photophosphorylation is carried out in collaboration of both photosystems $I$ and $II$. Electron released during photolysis of $H_{2}O$ is picked up by photocentre of $PS II$ called $P_{680}$. The same is extruded out when the photocentre absorbs light energy ($hv$). Electrons released during the photolysis of water are immediately accepted by oxidised reaction centre of $PS II$ (i.e., $P_{680}$) through an unknown substance $Z$.