why is light reaction called photophosrylation?

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Photophosphorylation or photosynthetic phosphorylation is the process of phosphate group transfer into ADP to synthesize energy rich ATP molecule making use of light as external energy source. It is believed that single molecule of ATP is formed from ADP and Pi (inorganic Phosphate) through ATPase complex. Since, this process of generation of ATP takes place in presence of light therefore light reaction is also called phosphorylation. 

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light reaction is called photo phosphorylation because synthesis of phosphorus takes place in the presence of light ( photo= light)
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During the reduction of NAD, ATP formation also takes place.This process of ATP formation in light is called Photophosphorylation
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