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Question

Clitellum is not a permanent structure of which of the following class?

A
Oligochaeta
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B
Polychaeta
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C
Hirudinea
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D
Both A and C
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Solution

The correct option is C Hirudinea
Clitellum is a glandular swelling in the epidermis of some annelid worms. It secretes a viscous fluid in which the eggs are deposited. It is a permanent structure in Oligochaetes and absent in Polychaetes. But it is temporary in Hirudinea class.
Therefore, the correct answer is option C.

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