The number of ganglia in the abdominal nerve-cord of cockroach is

Options

A. 6
B. 9
C. 10
D. 12

Answer

To determine the number of ganglia in the abdominal nerve cord of a cockroach, follow these steps:

### Step-by-Step Solution:

1. **Understand the Nervous System of Cockroach**: The cockroach has a complex nervous system that includes a series of ganglia. These ganglia are clusters of nerve cell bodies that are part of the central nervous system.

2. **Identify the Types of Ganglia**: The nervous system of the cockroach is divided into thoracic and abdominal ganglia. The thoracic ganglia are located in the thorax, while the abdominal ganglia are located in the abdomen.

3. **Count the Thoracic Ganglia**: There are three thoracic ganglia in the cockroach, which are known as:
- Prothoracic ganglia
- Mesothoracic ganglia
- Metathoracic ganglia

4. **Count the Abdominal Ganglia**: The abdominal nerve cord consists of six ganglia. These ganglia are located in the first six abdominal segments of the cockroach.

5. **Conclusion**: Therefore, the total number of ganglia in the abdominal nerve cord of the cockroach is 6.

### Final Answer:
The number of ganglia in the abdominal nerve cord of the cockroach is **6**.

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