What is the total number of abdominal ganglion in cockroach and upto which segment they are distributed? 

Options

A. `7,8^(th)`
B. `8,9^(th)`
C. `9,9^(th)`
D. `6,7^(th)`

Answer

To solve the question regarding the total number of abdominal ganglia in a cockroach and the segments they are distributed across, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Cockroach Abdomen**:
- The abdomen of a cockroach consists of 10 segments.

2. **Identify the Abdominal Ganglia**:
- The abdominal ganglia, also known as heliomic ganglia, are clusters of nerve tissues located within the abdomen.

3. **Determine the Segments Containing Abdominal Ganglia**:
- The abdominal ganglia are present in the following segments: 1, 2, 3, 4, 6, and 7.
- This means that ganglia are absent in segments 5, 8, 9, and 10.

4. **Count the Total Number of Abdominal Ganglia**:
- From the segments that contain ganglia (1, 2, 3, 4, 6, and 7), we can count a total of 6 abdominal ganglia.

5. **Identify the Highest Segment with Abdominal Ganglia**:
- The highest segment that contains abdominal ganglia is segment 7.

### Final Answer:
- The total number of abdominal ganglia in a cockroach is **6**, and they are distributed up to **segment 7**.

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