Give comparison between the following :
(b) Cyclic and non-cyclic photophosphorylation
(b) Distinction between cyclic and non-cyclic photophosphorylation :
|
Cyclic photophosphorylation |
Non-cyclic photophosphorylation |
|
|
1. |
It is performed by PS I independently. |
It is performed by both PS I and PS II with the help of each other. |
|
2. |
An external source of electrons is not required because the same electrons get recycled. |
The process requires an external electron donor, because the same electron is not recycled. |
|
3. |
It is not connected with photolysis of water, therefore, no oxygen is evolved. |
It is connected with photolysis of water and liberation of oxygen. |
|
4. |
It synthesizes only ATP. |
ATP synthesis with the production of NADPH. |
|
5 |
Electron flow is cyclic. |
Electron flow is non-cyclic. |
