Why is the Calvin cycle considered a dark reaction?
It occurs only at night.
It requires an absence of light.
It turns the plant dark green.
It can proceed in the dark.

Question

Why is the Calvin cycle considered a dark reaction?
It occurs only at night.
It requires an absence of light.
It turns the plant dark green.
It can proceed in the dark.

GPT-5 mini · Answer

"It can proceed in the dark."

Explanation: The Calvin cycle (carbon fixation) does not directly require light energy — it uses ATP and NADPH produced by the light reactions. Therefore it can run in the dark if ATP and NADPH are available, though in most plants those supplies are made during illumination.

Why is the Calvin cycle considered a dark reaction?
It occurs only at night.
It requires an absence of light.
It turns the plant dark green.
It can proceed in the dark.

All Answers 1

Submit Your Answer

Why is the Calvin cycle considered a dark reaction? It occurs only at night. It requires an absence of light. It turns the plant dark green. It can proceed in the dark.

All Answers 1