differentiate Cyclic and non cyclic photophosphorylation

Photosynthesis is a two-step process. In first step phosphorylation of ADP to ATP in the presence of sunlight take place (photophosphorylation) to produce a large amount of energy (ATP) which is further used for the second step of photosynthesis.

Photophosphorylation is of two types cyclic and non-cyclic.

In cyclic photophosphorylation Photon from the light excite an electron from the reaction center P680. This electron is then passed through ferredoxin to cytochrome b6f where phosphorylation of ADP to ATP takes place and then it passes to the plastocyanin which returns the electron to reaction centre P680. In cyclic photophosphorylation, the electron comes back to the reaction centre.

In non-cyclic photophosphorylation, electron does not come back to the reaction center P680 instead plastocyanin pass that electron to the reaction center P700 that uses that electron to convert NADP to NADPH.

Hope this clears your doubt.
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