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Q.
In the mouth parts of a cockroach, the labium forms (i) while (ii) acts as a tongue
Structural Organisation in Animals
Solution:
The mouth parts of cockroach are of biting and chewing type consisting of labrum (upper lip), a pair of mandibles, a pair of maxillae and a labium (lower lip). Within the oral cavity enclosed by the mouthparts, lies a median flexible lobe called hypopharynx (tongue)