Question

Which of the following statements is/are, not correct, regarding the head of a cockroach.

i). It is formed by the fusion of 8 plates.

ii). Head is arranged in an axis perpendicular to the axis of the body.

iii). Mouth parts are of varying sizes.

iv). Head is Hexagonal in shape.

• A. (i) and (ii)
• B. (iii) and (iv)
• C. (i) and (iv)
• D. (ii) and (iii)

Answer 1

The correct option is C

(i) and (iv)

The head is triangular in shape. It lies anteriorly at right angles to the longitudinal body axis. The head is formed by the fusion of six segments. The flexible neck facilitates movement in all directions. A pair of compound eyes is present in the head capsule. Membranous sockets lie in front of eyes and a pair of thread-like antennae arises from them. Antennae have sensory receptors.
Answer : The head of a cockroach is triangular in shape and is formed by the fusion of 6 plates namely Vertex, Frons, Gena, Clypeus, Labrum and Labium.