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why is dark reaction is called so?

ATP and NADPH2, formed during the earlier phase are essential for the assimilation of CO2 to carbohydrates. This assimilation reaction takes place in the stroma, where all the necessary enzymes are present. Collectively, these reactions are known as carbon reactions or dark reactions.
dark reaction is the second step in the mechanism of photosynthesis.this chemical process of photosynthesis occurring independent of light is called dark reaction.


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