Question

Organ of mastication in cockroach is [CPMT 2002]
A) Labrum
B) Labium
C) Mandibles
D) Maxilla

Answer 1

B.............................

Answer 2

Organ of mastication in cockroach is C) Mandibles.

Each mouth part of the cockroach has a very specific function. The labrum is a flap-like structure which holds the food down so that it can be chewed. The labium is a structure which closes the mouth cavity from below.

However, the mandibles are horizontal hard chitinous structures, which are hinged to the skull of the cockroach. These move in a horizontal manner to grind and chew the food into smaller pieces and are also called the primary jaws of the cockroach.