Sample Questions — Transport of gases
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MCQ
Why does CO₂ dissociate from hemoglobin in alveoli?
✅ Correct Answer: B
These conditions favor CO₂ release from carbamino-haemoglobin.
MCQ
What percentage of carbon dioxide is transported by RBCs?
✅ Correct Answer: B
CO₂ binds to hemoglobin forming carbaminohemoglobin in RBCs.
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MCQ
Match the Following
Column I
A. O₂ via RBCs
B. O₂ dissolved in plasma
C. CO₂ as bicarbonate
D. CO₂ bound to Hb
Column II
1. ~3%
2. ~97%
3. ~70%
4. ~20–25%
✅ Correct Answer: D
Oxygen and carbon dioxide transport proportions as described in NCERT.
MCQ
Assertion (A): At high pO₂ and low pCO₂, hemoglobin has a high affinity for oxygen.
Reason (R): These conditions promote oxyhaemoglobin formation in alveoli.
✅ Correct Answer: A
In alveoli, high pO₂ and low pCO₂ favor oxygen binding with hemoglobin.
MCQ
What is the enzyme in RBCs that catalyzes CO₂ conversion to bicarbonate?
✅ Correct Answer: A
This enzyme facilitates reversible reaction of CO₂ into HCO₃⁻.
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