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CBSE Class 10 Answered

Explain photophosphorilation
Asked by | 30 Jul, 2008, 11:33: PM
answered-by-expert Expert Answer

The process of generating ATP from ADP by addition of one phosphate group in presence of light energy is called photophosphorylation. Photophosphorylation is carried out by means of a proton-motive force generated by the thylakoid membrane of the chloroplast.  In light reaction, there are 2 pathways of photophosphorylation i.e. cyclic and non-cyclic.

During cyclic process, the high energy rich electron emitted from chlorophyll-a returns to chlorophyll-a, hence the name. Here only ATP is produced.

But in non-cyclic photophosphorylation, the high energy rich electron emitted by chlorophyll-a does not return to chlorophyll-a. Here both ATP and NADPH2 are produced.

Answered by | 31 Jul, 2008, 10:22: AM
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