Sample Questions — The C4 pathway
Try 5 questions below from The C4 pathway. Get all 20 in the MedicNEET app.
MCQ
Why is the initial fixation of COâ‚‚ in Câ‚„ plants more efficient under high temperature?
✅ Correct Answer: A
PEPCO can fix COâ‚‚ efficiently under high temperatures without being affected by Oâ‚‚.
MCQ
What spatial separation occurs in the Câ‚„ pathway that helps reduce photorespiration?
✅ Correct Answer: C
This separation ensures that RuBisCO in bundle sheath cells encounters high COâ‚‚ concentration, minimizing oxygenase activity.
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MCQ
The first stable compound formed in Câ‚„ plants is:
✅ Correct Answer: D
Câ‚„ plants form a 4-carbon oxaloacetic acid initially.
MCQ
Why is more ATP consumed in C₄ photosynthesis than in C₃ photosynthesis?
✅ Correct Answer: C
The C₄ cycle includes energy-demanding steps not present in C₃, specifically PEP regeneration.
MCQ
Why do C₄ plants avoid photorespiration more efficiently than C₃ plants?
✅ Correct Answer: C
In Câ‚„ plants, COâ‚‚ is concentrated in bundle sheath cells where RuBisCO is active, reducing its interaction with Oâ‚‚.
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