Multiple Choice
The Calvin cycle requires all of the following except:
8
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9. Photosynthesis
Calvin Cycle
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The 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.
Verified step by step guidance1
The Calvin cycle is part of photosynthesis, which occurs in the chloroplasts of plant cells. It is responsible for converting carbon dioxide and water into glucose using energy from ATP and NADPH.
ATP and NADPH are produced during the light-dependent reactions of photosynthesis, which occur in the thylakoid membranes when the plant is exposed to light.
During the day, light energy is captured by chlorophyll and other pigments, driving the production of ATP and NADPH through the electron transport chain and photophosphorylation.
The Calvin cycle uses ATP and NADPH to convert carbon dioxide into glucose. Without these molecules, the cycle cannot proceed, which is why it typically does not occur at night when light-dependent reactions are inactive.
Therefore, the Calvin cycle is indirectly dependent on light because it requires ATP and NADPH, which are only produced when the photosystems are illuminated.
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