Outer border of tergum bonds downwards in cockroach and attaches with :

Options

A. Muscles
B. Sternum
C. Pleura
D. Fat body cells

Answer

To answer the question "Outer border of tergum bonds downwards in cockroach and attaches with:", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure of Cockroach**:
- The cockroach has a dorsoventrally flat and compressed body.
- Its body is covered by a hard chitinous exoskeleton.

**Hint**: Remember that the cockroach's body is divided into different plates.

2. **Identifying the Plates**:
- The exoskeleton is made up of separate plates known as sclerites.
- The dorsal plate is referred to as the tergum.
- The ventral plate is called the sternum.

**Hint**: Focus on the terminology used for the different parts of the cockroach's body.

3. **Understanding the Connections**:
- The plates of the exoskeleton are joined laterally by structures called pleura.
- The outer border of the tergum (the dorsal plate) bonds downwards.

**Hint**: Think about how the different plates are connected to each other.

4. **Identifying the Correct Attachment**:
- The question specifically asks where the outer border of the tergum attaches.
- Based on the structure, the outer border of the tergum attaches to the pleura.

**Hint**: Eliminate options that do not fit the anatomical structure of the cockroach.

5. **Final Answer**:
- Therefore, the correct answer is that the outer border of the tergum bonds downwards and attaches with **pleura**.

### Summary:
The outer border of the tergum in a cockroach attaches downwards to the pleura.