Question

Which of the following is a tongue-like structure that has backward curved teeth on its surface

A. radula

B. siphon

C. valve

D. nacre

Answer 1

The radula is a tongue-like structure that has backward curved teeth on its surface.

The radula is a structure with small curved or chitinous teeth, located in the mouth of all groups of mollusks except bivalves.

• It consists of a tape-shaped membrane on which rows of teeth are arranged on its surface, it is supported by the odontophore (cartilaginous); it regenerates from its posterior portion.

• Its function is related to the feeding of organisms.

Therefore, we can conclude that the radula is a tongue-like structure that has backward curved teeth on its surface.

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