Choose the correct answers from the alternatives given. When an earthworm secretes a slime layer to receive eggs and sperm and form a cocoon, this secretion is produced by the:
A
peritoneum
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B
clitellum
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C
nephridium
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D
prostomium
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Solution
The correct option is B clitellum The clitellum is a thick, saddle-like ring found in the epidermis (skin) of the worm, usually with a light-coloured pigment. To form a cocoon for its eggs, the clitellum secretes a viscous fluid. This organ is used in sexual reproduction of some annelids such as earthworms.