Q. In the mouth parts of a cockroach, the labium forms (i) while (ii) acts as a tongue

 1728  194 Structural Organisation in Animals Report Error

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)