Exoskeleton of each segment in cockroach consists of

Options

A. Dorsal tergum and a ventral sternum
B. Dorsal sternum and a ventral tergum
C. Sternum only
D. Tergum only

Explanation

To answer the question regarding the exoskeleton of each segment in a cockroach, we will break down the components of the exoskeleton step by step.

### Step-by-Step Solution:

1. **Understanding the Exoskeleton**: The exoskeleton of a cockroach is a hard outer structure that provides support and protection. It is primarily made of a substance called chitin, which is a polysaccharide.

2. **Components of the Exoskeleton**: The exoskeleton is made up of different parts known as sclerites. These sclerites are categorized into three main types:
- **Dorsal Sclerite**: This is referred to as the tergite or tergum.
- **Ventral Sclerite**: This is known as the sternite or sternum.
- **Lateral Sclerite**: This is called the pleurite.

3. **Identifying the Correct Answer**: The question asks about the specific components of the exoskeleton in each segment of the cockroach. The correct combination of these components is:
- **Dorsal Part**: Tergum (tergite)
- **Ventral Part**: Sternum (sternite)

4. **Conclusion**: Therefore, the exoskeleton of each segment in a cockroach consists of a dorsal tergum and a ventral sternum.

### Final Answer:
The exoskeleton of each segment in a cockroach consists of **dorsal tergum and ventral sternum**.

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