Concept:Oxygen and carbon(IV) oxide are transported mainly by haemoglobin present inside red blood cells.
Explanation:Erythrocytes are red blood cells that contain haemoglobin.
Haemoglobin has a very high affinity for oxygen (
O2) and carbon(IV) oxide (
CO2).
It binds oxygen reversibly in the lungs and releases it in body tissues.
It also transports carbon(IV) oxide as carbaminohaemoglobin to the lungs for exhalation.
Lymphocytes are white blood cells involved in immunity, not gas transport.
Thrombocytes, or platelets, help in blood clotting and do not carry gases.
Blood plasma dissolves some gases but has a much lower affinity than haemoglobin.
Therefore, erythrocytes show the greatest affinity for oxygen and carbon(IV) oxide.
Answer:C. Erythrocyte