9. Photosynthesis
Calvin Cycle
Multiple Choice
Multiple ChoiceThe reactions of the Calvin cycle are not directly dependent on light, but they usually do not occur at night. Why?
A
It is often too cold at night for these reactions to take place.
B
Carbon dioxide concentrations decrease at night.
C
Plants usually open their stomata at night.
D
At night, no water is available for the Calvin cycle.
E
The Calvin cycle requires products only produced when the photosystems are illuminated.
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