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To synthesise one molecule of glucose, the Calvin cycle must consume
A3 CO₂, 9 ATP, 6 NADPH
B1 CO₂, 1 ATP, 1 NADPH
C6 CO₂, 6 ATP, 6 NADPH
D6 CO₂, 18 ATP, 12 NADPH
Answer & Solution
Correct answer: D. 6 CO₂, 18 ATP, 12 NADPH
Glucose has 6 carbons, so 6 CO₂ must be fixed (6 turns of the cycle). Each turn consumes 3 ATP and 2 NADPH, giving 18 ATP and 12 NADPH total. This high cost per glucose is why plants need continuous supply from the light reactions.
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