A) formation of cocoon
B) secretion of hormone
C) nutrition of sperm
D) respiration
Correct Answer: A
Solution :
Clitellum is a girdle-like thick band of glandular tissue, which completely and permanently surrounds the segments 14 to 16. Clitellum secretes mucus, albumen and an egg case or cocoon for eggs. Respiration in Pheretima takes place by diffusion of gases through general body surface. Intake of \[{{\text{O}}_{\text{2}}}\] and giving out of \[\text{C}{{\text{O}}_{\text{2}}}\]takes place between blood capillaries of outer epidermis and surface film of mucus. The haemoglobin (dissolved in plasma) acts as respiratory pigment.
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