The upcoming discussion will update you about the difference between cyclic photophosphorylation and non-cyclic photophosphorylation.
Difference # Cyclic Photophosphorylation:
1. It is found dominantly in bacteria.
2. It involves photosystem I only.
3. Electrons move in a closed circle. Electron expelled from chlorophyll (P700) returns to it after passing through a series of electron acceptors in an ETS.
4. It is not involved in the photolysis of water and therefore, no oxygen is involved.
5. It sythesises only ATP, reduced NADP, i.e., NADPH2 is not synthesised.
6. It operates under low light intensity, anaerobic conditions and the poor availability of CO2.
Difference # Non-Cyclic Photophosphorylation:
1. This is dominant in green plants.
2. It involves both photosystems I and II.
3. Electrons do not move in a closed circle. Here electron expelled by reaction centre (P680) are not returned to them. Here water is the ultimate source of electrons and NADP+ is the final acceptor.
4. It is involved in the photolysis of water, and therefore oxygen is released as a by-product.
5. It is involved in the synthesis of both ATP and NADPH2.
6. It takes place under optimum light, aerobic conditions and in the presence of sufficient CO2.