alleryHow many CO₂, ATP, NADPH needed to make one glucose via Calvin cycle?
A12, 18, 6
B6, 6, 12
C3, 9, 6
D6 CO₂, 18 ATP, 12 NADPH (per glucose)
Answer & Solution
Correct answer: D. 6 CO₂, 18 ATP, 12 NADPH (per glucose)
Calvin cycle per CO₂: 3 ATP + 2 NADPH.
For one glucose (6 CO₂): 18 ATP + 12 NADPH.
**Compare with cellular respiration:** oxidation of glucose yields ~36-38 ATP.
Photosynthesis efficiency is lower than full glucose energy content.
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