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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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During light dependent process photosynthetic pigments absorb the light energy, and convert it into chemical energy ATP and `NADPH_2` . This reaction occurs in the presence of light in the grana of chloroplast.
(ii) During light independent reaction `CO_2` is reduced into carbohydrates with the help of hght generated ATP and `NADPH_2`.This occurs in stroma of chloroplast.
(iii)Thus light dependent reaction occurs before the light independent reaction.
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