Differences Between Cyclic Photophosphorylation and Non-Cyclic Photophosphorylation
| Cyclic Photophosphorylation | Non-cyclic Photophosphorylation |
|---|
| involves the use of only one photosystem | involves both photosystems |
| does not involve the reduction of NADP | involves the reduction of NADP |
| when light is absorbed by photosystem 1, the excited electron may enter into an electron transport chain to produce ATP | when light is absorbed by photosystem 2, the excited electrons enter into an electron transport chain to produce ATP |
| following that, the de-energised electron returns to the photosystem, restoring its electron supply, making it cyclic) | photoactivation of photosystem 1 results in the release of electrons, which reduces NADP+ (resulting in the formation of NADPH) |
| Photolysis of water releases electrons which replace those lost by photosystem 2. |