A) open type with Hb in RBC
B) open type with Hb in plasma
C) closed type with Hb in RBC
D) closed type with Hb in plasma
Correct Answer: D
Solution :
Blood vascular system in earthworm (Pheretima posthuma) is closed type (i.e., blood flows in definite blood vessels). The blood is red in colour due to presence of haemoglobin or erythrocruiorin dissolved in plasma. In vertebrates the blood vascular system is also closed type, but the haemoglobin or other Respiratory pigment is present in RBCs of blood.
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