c. The light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies the light reactions with sugars to produce ATP.
Light reaction and Calvin cycle is light dependent reaction in photosynthesis. Light reaction in photosynthesis is light-dependent whereas the Calvin cycle or dark reaction in photosynthesis is light-independent.
The light reactions provide the Calvin cycle with oxygen for carbon fixation, and the Calvin cycle provides the light reactions with sugars to produce ATP. light reactions gives ATP and NADPH to the carbon fixation process in the Calvin cycle, They provide water and electrons to the light reactions.
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