NEET Zoology (general) MCQ Question
Which combination of statements about the transport of gases in the blood is correct?
About 97% of O2 is transported by RBCs, and 70% of CO2 is carried as bicarbonate.
The solubility of O2 is higher than that of CO2 in the blood.
Haemoglobin can bind with four molecules of CO2 in a reversible manner.
Only 3% of O2 is transported in a dissolved state through plasma.
Correct Answer
Detailed Explanation
Statement A is correct as it accurately reflects that 97% of O2 is transported by RBCs and 70% of CO2 is carried as bicarbonate. Statement B is incorrect because CO2 is 20-25 times more soluble than O2. Statement C is incorrect since haemoglobin primarily binds O2, while CO2 is transported differently. Statement D is misleading, as only 3% of O2 is dissolved in plasma, but this does not pertain to CO2.
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