Sample Questions — Where are the ATP and NADPH used?
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MCQ
The ATP and NADPH synthesized in the light reaction are used in:
✅ Correct Answer: A
These energy carriers fuel the reduction of CO₂ in the Calvin cycle.
MCQ
Why is RuBP considered the “CO₂ acceptor”?
✅ Correct Answer: D
RuBP combines with CO₂ in the presence of RuBisCO to initiate the cycle.
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MCQ
Match the stages of Calvin cycle with the events:
✅ Correct Answer: A
A → Carboxylation: RuBP reacts with CO₂, catalyzed by RuBisCO → CO₂ fixation step; B → Reduction: ATP and NADPH reduce 3-PGA to triose phosphate (G3P); C → Regeneration: A portion of G3P is used to reform RuBP; D → Glucose synthesis: Two G3P molecules combine and undergo polymerisation to form glucose. These three primary stages (A–C) are directly named in NCERT. Glucose synthesis (D) is the biological outcome, not a formal stage but implied.
MCQ
What determines whether RuBisCO will fix CO₂ or O₂? c) CO₂ to O₂ concentration ratio around the enzyme
✅ Correct Answer: C
The relative concentrations of CO₂ and O₂ influence whether RuBisCO functions as a carboxylase or oxygenase.
MCQ
Which of the following statements is incorrect regarding Calvin cycle?
✅ Correct Answer: B
While light is not directly used, the cycle is dependent on ATP and NADPH from light reaction.
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