Question

Give comparison between the following: Cyclic and non-cyclic photophosphorylation

Answer 1

cyclic photophosphorylation exists to provide energy for the calvin cycle and involves only p680 in photosystem ll and its product is ATP. Non-cyclic photophosphorylation is carried out using p700 in photosystem l and p680 in photosystem ll and it produces nadph and atp.

Answer 2

NCERT based Answer for Class 11 Biology Students

Cyclic Photophosphorylation

 Performed by PS I independently.

 External source of electrons is not required. Same electrons are recycled.

 Synthesizes only ATP.  

 Operates under low light intensity.

 Occurs in stromal thylakoid.

Non-Cyclic Photophosphorylation

 Performed by PS I and PS II.

 Electrons are supplied by photolysis of water.

 Synthesizes ATP and NADPH.

 Operates under optimum light.

 Occurs in granal thylakoids.

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