Which mouth part of cockroch acts as upper lip?
(a) Labium
(b) Labrum
(c) First maxilla
(d) Hypopharynx

Options

A. Labium
B. Labrum
C. First maxilla
D. Hypopharynx

Answer

To determine which mouth part of the cockroach acts as the upper lip, we can analyze the options provided:

1. **Understanding the Mouth Parts of Cockroach**:
- The mouth parts of a cockroach are adapted for biting and chewing.
- The main mouth parts include the labrum, mandibles, maxillae, labium, and hypopharynx.

2. **Identifying Each Mouth Part**:
- **Labrum**: This is the structure that functions as the upper lip.
- **Mandibles**: These are the jaw-like structures used for biting.
- **Maxillae**: These are paired structures that assist in manipulating food.
- **Labium**: This acts as the lower lip.
- **Hypopharynx**: This is a flexible lobe that acts like a tongue.

3. **Analyzing the Options**:
- (a) **Labium**: Acts as the lower lip, so this is incorrect.
- (b) **Labrum**: This is the upper lip, making this the correct answer.
- (c) **First maxilla**: This is not the upper lip, so this is incorrect.
- (d) **Hypopharynx**: This acts as a tongue, so this is incorrect.

4. **Conclusion**:
- The mouth part of the cockroach that acts as the upper lip is **(b) Labrum**.