Mark the incorrect statement regarding the head of the cockroach.

Options

A. It is hypognathous.
B. Formed by the fusion of six embryonic segments
C. Head bears appendages forming biting and chewing type of mouth parts
D. A pair of broad antennae arise from membranous sockets lying in front of eyes.

Answer

To determine the incorrect statement regarding the head of the cockroach, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Understanding Hypognathus Orientation**:
- The first statement mentions that the cockroach has a hypognathous head. Hypognathous refers to the orientation of the head where the long axis of the head is perpendicular to the rest of the body. This is indeed true for cockroaches, as they exhibit this type of head orientation.
- **Conclusion**: This statement is correct.

2. **Fusion of Embryonic Segments**:
- The second statement claims that the head of the cockroach is formed by the fusion of six embryonic segments. This is accurate, as the head of a cockroach is indeed a fusion of six segments, contributing to its triangular shape and mobility due to a flexible neck.
- **Conclusion**: This statement is also correct.

3. **Mouth Parts Functionality**:
- The third statement asserts that the head has appendages that make mouth parts of biting and chewing type. However, while the mouthparts of a cockroach are designed for grinding food, they are not primarily for biting and chewing. The mouthparts include labrum, mandibles, maxillae, and labium, but their primary function is grinding rather than biting.
- **Conclusion**: This statement is incorrect.

### Final Answer:
The incorrect statement regarding the head of the cockroach is the third statement, which claims that the head has appendages that bear biting and chewing type mouth parts.

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