Published by:
CGP EDU Academic Team
Published on: August 21, 2026
How many molecules of ATP and NADPH are required for every molecule of 
fixed in the Calvin cycle?
A
3 molecules of ATP and 3 molecules of NADPH
B
3 molecules of ATP and 2 molecules of 
C
2 molecules of ATP and 3 molecules of 
D
2 molecules of ATP and 2 molecules of 
Text Solution
Verified by ExpertsThe correct answer is:
For every 
molecule entering the Calvin cycle, 3 molecules of ATP and 2 of NADPH are required. The Calvin cycle can be described under three stages: carboxylation, reduction and regeneration. Reduction step involve utilisation of 2 molecules of ATP for phosphorylation and two of NADPH for reduction per 
molecule fixed. The regeneration steps require one ATP for phosphorylation to form RuBP.
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