Botany - Photosynthesis in Higher Plants Question with Solution | TestHub
Assertion : Cyclic photophosphorylation synthesises ATP. Reason : ATP synthesis in cyclic photophosphorylation is associated with NADPH formation.
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Solution:
In case of cyclic photophosphorylation, the electron while passing between ferredoxin and plastoquinone and/or over the cytochrome complex, loses sufficient energy to form ATP from ADP and inorganic phosphate. In cyclic photophosphorylation no NADPH formation takes place. But in case of noncyclic photophosphorylation, NADP - reduced through released during photolysis forms NADPH. ATP synthesis is not direct and the energy released by electron is actually used for pumping ions across the thylakoid membrane. It creates a proton gradient. The gradient triggers the coupling factor to synthesise ATP from ADP and inorganic phosphate.
