Zoology-(general)
NEET Zoology (general) MCQ Question
Type: MCQ-conceptual-Medium-Class 11
Which combination of statements about the transport of gases in the blood is correct?
A
About 97% of O2 is transported by RBCs; CO2 is primarily carried as bicarbonate.
B
O2 is mostly carried dissolved in plasma; CO2 is also predominantly transported by RBCs.
C
Haemoglobin can bind a maximum of three O2 molecules; CO2 is mainly carried in a dissolved state.
D
20-25% of CO2 is transported by RBCs; O2 binding with haemoglobin is unrelated to the partial pressure of O2.
Correct Answer
Option A
Detailed Explanation
The NCERT context indicates that about 97% of O2 is carried by RBCs and that nearly 70% of CO2 is transported as bicarbonate, making option A correct. Other options contain inaccuracies regarding the transport mechanisms.
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