Q.Head of cockroach is called hypognathous. Why?

Step 1. In many insects, the head can be oriented in different ways relative to the body and mouthparts - some point their mouthparts forward (prognathous), others downward (hypognathous).

Step 2. The cockroach's small, triangular head lies at right angles to the long axis of its body, rather than being held in line with it.

Step 3. Because of this orientation, and because of a flexible neck that allows the head considerable mobility, the mouthparts end up pointing downward, toward the ground or the substrate the cockroach is feeding on. …

Link the head's right-angled orientation to the body axis with the resulting downward dire …

• Describing hypognathous as simply 'the head is small' without explaining the downward mouthpart orientation that actually defines the term. …