Although the reactions of the Calvin cycle do not depend directly on light, they do not usually occur at night. Why?

A) It is usually too cold at night for these reactions to take place.
B) Carbon dioxide concentrations decrease at night.
C) The Calvin cycle depends on products of the light reactions that cannot occur at night.
D) Plants must open their stomata to restore their water balance each night.
E) At night, plants have a negative water balance with the soil, due to reduced evaporation


C) The Calvin cycle depends on products of the light reactions that cannot occur at night.

Biology & Microbiology

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