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.

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Photosynthesis in Higher Plants