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difference btw light reaction and dark reaction
The process of photosynthesis can be neatly divided into two sets of reactions: the light dependent reactions and the light-independent reactions. The light-dependent reactions occur first and require an input of water and light. They produce three things: the oxygen we breathe, NADPH, and ATP. These last two products of the light reactions are then consumed during the second stage of photosynthesis: the dark reactions. These reactions, which need CO2, NADPH, and ATP as inputs, produce sugar and recycle the NADP+ and ADP to be used by the next set of light-dependent reactions.


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