AP Biologymediummcq1 pt
If a plant is kept in total darkness, its Calvin cycle will
A.halt once ATP and NADPH run out
B.speed up using stored oxygen
C.switch to making NADPH
D.continue indefinitely from CO₂ alone
Explanation
Core Concept
The cycle itself needs no light, but its fuel — ATP and NADPH — comes only from the light reactions. Depleted stores bring fixation to a stop.
Correct Answer
Ahalt once ATP and NADPH run out
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