Question

distinguish between cyclic and non cyclic photophosphorylation

Answer 1

Involves both Photosystem I and II (PS I and PS II)3The electron circle is closedThe electron circle is not closed4Electron is first expelled from the reaction center of PS I – P700Electron is first expelled from the reaction center of PS II (P680)5Electron is returned back to the P700 after passing through the electron transport system (ETS)Electron is not returned to the reaction center (P680), rather it is accepted by NADP+6P700 is the electron donor and the final electron acceptorP680 is the first electron donor and NADP+ is the final electron acceptor7Photolysis of water does not occurPhotolysis of water occur8Oxygen is not evolvedOxygen is evolved9Synthesize only ATP, no reduced coenzymes are synthesizedSynthesize both ATP and reduced coenzymes10Cyclic photophosphorylation usually occurs at low light intensityNon-cyclic photophosphorylation is favoured by high light intensity

Answer 2

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⭕ Cyclic photophosphorylation :

➡️ It is performed by photosystem l independently.

➡️ An external source of electrons is not required.

➡️ It is not concerned with photolysis of water. Therefore, no oxygen is evolved.

➡️ It synthesis ATP only.

➡️ It occurs mostly in stroma lamellae membrane.

⭕ Non - Cyclic photophosphorylation :

➡️ It is performed by collaboration of both photosystem l and ll.

➡️ The process requires an external electron donor.

➡️ It is connected with photolysis of water and liberation of oxygen occurs.

➡️ It is not only connected with ADP synthesis, but also with production of NADPH.

➡️ It occurs in the granal thylakoids.

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