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QUESTION
Q59) What is true about RBCs in human .....[ CBSE 2010 ]

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Most oxygen, 98.5 percent, is bound to a protein called hemoglobin present in RBC and carried to the tissues Only 1.5 percent of oxygen in the blood is dissolved directly into the blood itself.
About 20 – 25% of CO2 is transported by the red blood cells as carbaminohaemoglobin. Carbon dioxide binds to the amino groups on the polypeptide chains of haemoglobin and forms a compound known as carbaminohaemoglobin.


Answer : (d)