Which one is not correct wrt to 'labrum' 

Options

A. It forms anterior wall of pre-oral cavivty
B. It bears gustatory sensillae
C. It serves to hold and taste food
D. It is lower lip

Answer

To solve the question "Which one is not correct with respect to 'labrum'?", let's analyze the options step by step:

### Step 1: Understand the Function and Position of Labrum
- The labrum is a part of the mouth structure in insects, particularly in cockroaches. It is often referred to as the upper lip.
- It forms the anterior wall of the preoral cavity, which is the space in front of the mouth where food is held before ingestion.

**Hint:** Remember that the labrum is located at the front of the mouth structure in cockroaches.

### Step 2: Evaluate Each Statement
1. **It forms the anterior wall of the preoral cavity.**
- This statement is correct. The labrum does indeed form the anterior wall of the preoral cavity.

2. **It bears gustatory sensilla.**
- This statement is also correct. The labrum contains sensory structures that allow the insect to taste food.

3. **It serves to hold and taste food.**
- This statement is correct as well. The labrum plays a role in holding food and has sensory functions to taste it.

4. **It is the lower lip.**
- This statement is incorrect. The labrum is actually the upper lip, while the labium is considered the lower lip.

**Hint:** Identify the correct anatomical positions of the mouth parts to distinguish between the upper and lower lips.

### Step 3: Identify the Incorrect Statement
- After evaluating all the statements, the one that is not correct with respect to the labrum is: **"It is the lower lip."**

### Final Answer
The incorrect statement regarding the labrum is: **"It is the lower lip."**