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Why should the light dependent reaction ...

Why should the light dependent reaction occur before the light independent reaction?

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In light dependent photosynthesis, the photosynthetic pigment absorb the light energy and convert it into chemical energy, ATP and NADPH,. These products move out from grana to stroma of the chloroplast for the light independent reactions (Dark reaction or Biosynthetic path way). During this reaction, `CO_2` is reduced in the carbohydrates with the help of light generated ATP and `NADPH_2` . So the light dependent reaction should occur before the light independent reaction.
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