| Cyclic photophosphorylation | Non – cyclic photophosphorvlution |
| 1. Electrons emitted by chlorophyll return back to the same chlorophyll. | The electrons emitted by chlorophyll do not return back to the same chlorophyll |
| 2. First electron acceptor is FRS. | First electron acceptor is CO – Q |
| 3. It forms only ATP. | NADPH2 and ATP are formed. |
| 4. Does not involve photolysis of H2O. | Involves photolysis of H2O. |
| 5. No evolution of O2. | There is evolution O2. |
| 6. Only Photosystem-I (P700) is involved in this cycle. | Both Photosystem PSI (P700) as well as PS-II (P680) are involved. |