Which of the following mouth parts occurs in pair?

Options

A. Labium
B. Mandible
C. Labrum
D. Hypopharynx

Answer

To determine which mouth parts occur in pairs, we need to analyze the options provided: labium, mandible, labrum, and hypopharynx.

### Step-by-Step Solution:

1. **Understand the Mouth Parts**:
- **Labium**: This is the lower lip of the insect and is typically a single structure.
- **Mandible**: These are the jaw-like structures that are present in pairs. In insects like cockroaches, there are two mandibles, one on each side of the mouth.
- **Labrum**: This is the upper lip of the insect and is also a single structure.
- **Hypopharynx**: This is a tongue-like structure that is usually a single structure as well.

2. **Identify the Paired Structure**:
- From the analysis, the mandibles are the only mouth parts that occur in pairs. Each mandible functions to cut, grasp, and crush food.

3. **Conclusion**:
- Therefore, the correct answer to the question is **mandible** (option number two).

### Final Answer:
The mouth part that occurs in pairs is **mandible**.

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