Abdominal ganglion in cockroach is not found in this segment (s).

Options

A. 2 and 3
B. 4
C. 5
D. 6

Answer

To determine which segment of the cockroach does not have an abdominal ganglion, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Cockroach**:
- The cockroach's body is segmented and divided into three main regions: the head, thorax, and abdomen.

2. **Identify the Number of Segments**:
- The abdomen of the cockroach consists of 10 segments.

3. **Know the Ganglion Distribution**:
- There are a total of 9 ganglions in the cockroach: 3 are located in the thorax and 6 are in the abdominal region.

4. **Examine the Abdominal Segments**:
- Out of the 10 abdominal segments, we need to identify which segment lacks a ganglion.

5. **Identify the Segment Without a Ganglion**:
- It is known that the fifth abdominal segment does not have any ganglion.

6. **Conclude the Answer**:
- Therefore, the abdominal ganglion in cockroach is not found in the fifth segment.

### Final Answer:
The abdominal ganglion in cockroach is not found in the **fifth segment**.

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