The reactions of Calvin cycle not directly dependent on light, but they usually do not occur at night. Why?
concentration in night is too high for these reactions to occur.
Text Solution
Verified by ExpertsCalvin cycle that take place in stroma of the chloroplasts during photosynthesis, is light-independent. But they usually do not occur in night because this cycle is dependent on the products of the light reactions. The Calvin cycle proceeds in three stages: carboxylation 
is covalently linked to a carbon skeleton (RuBP)], reduction (carbohydrate is formed at the expense of ATP and NADPH) and regeneration (the 
acceptor RuBP reforms at the expense of ATP.
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