Brain of Cockroach is made of two groups of

Options

A. One ganglia
B. Two ganglia
C. Three ganglia
D. Four ganglia

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the composition of the brain of a cockroach, specifically how many groups of ganglia it consists of.

2. **Identifying the Brain Structure**: The brain of a cockroach is part of its central nervous system, which is located in the head region.

3. **Defining Ganglia**: Ganglia are clusters of neurons that are part of the nervous system. In the case of the cockroach, the nervous system is organized into a series of ganglia.

4. **Components of the Cockroach Brain**: The central nervous system of the cockroach consists of three main groups of ganglia:
- **Supra-oesophageal ganglia**: This is a bilobed mass formed by the fusion of three pairs of ganglia.
- **Circum-oesophageal ganglia**: This surrounds the oesophagus.
- **Sub-oesophageal ganglia**: This is located below the oesophagus.

5. **Identifying the Specific Ganglia**: The supra-oesophageal ganglia are further divided into three pairs:
- **Proto-cerebrum**
- **Deuto-cerebrum**
- **Tritocerebrum**

6. **Conclusion**: Therefore, the brain of the cockroach is made up of three groups of ganglia. The correct answer to the question is **three ganglia**.

**Final Answer**: The brain of the cockroach is made of three ganglia.

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