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  4. The reactions of Calvin cycle not directly dependent on light, but they usually do not occur at night. Why?

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Q. The reactions of Calvin cycle not directly dependent on light, but they usually do not occur at night. Why?

Photosynthesis in Higher Plants

Solution:

Calvin 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 $\left[ CO _2\right.$ is covalently linked to a carbon skeleton (RuBP)], reduction (carbohydrate is formed at the expense of ATP and $NADPH$ ) and regeneration (the $CO _2$ acceptor RuBP reforms at the expense of ATP.