In Cockroach nerve cord ganglia are

Options

A. Two pairs thoracic and four pairs abdominal
B. Three pairs thoracic and six pairs abdominal
C. Three pairs thoracic and five pairs abdominal
D. Two pairs thoracic and seven pairs abdominal

Answer

To answer the question regarding the nerve cord ganglia in a cockroach, we can break down the information as follows:

### Step-by-Step Solution:

1. **Understanding the Structure of the Nerve Cord**:
- The cockroach has a ventral nerve cord that runs along the length of its body. This nerve cord is segmented and consists of ganglia.

2. **Identifying the Types of Ganglia**:
- The nerve cord in cockroaches is divided into two main regions: the thoracic region and the abdominal region.

3. **Thoracic Ganglia**:
- In the thoracic region, there are three large ganglia. These are specifically referred to as:
- Prothoracic ganglion (associated with the first thoracic segment)
- Mesothoracic ganglion (associated with the second thoracic segment)
- Metathoracic ganglion (associated with the third thoracic segment)

4. **Abdominal Ganglia**:
- In the abdominal region, there are six ganglia. These ganglia correspond to the first through the sixth abdominal segments.

5. **Total Count of Ganglia**:
- Therefore, in total, the cockroach has:
- 3 pairs of thoracic ganglia (one for each thoracic segment)
- 6 pairs of abdominal ganglia (one for each abdominal segment)

6. **Conclusion**:
- The correct answer to the question is that in cockroaches, the nerve cord ganglia consist of 3 pairs of thoracic ganglia and 6 pairs of abdominal ganglia.

### Final Answer:
The nerve cord ganglia in cockroaches are 3 pairs of thoracic ganglia and 6 pairs of abdominal ganglia.

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