Body cavity of Cockroach is formed by

Options

A. Coelom
B. Pseudocoel
C. Swellings of embryonic blood vessels
D. Swelling of embryonic gut

Answer

### Step-by-Step Solution:

1. **Understanding the Body Structure**: The cockroach has a segmented body divided into three main parts: the head, thorax, and abdomen. Each part has specific functions and structures.

2. **Identifying the Body Cavity**: The body cavity of the cockroach is referred to as the hemocoel, which is a type of coelomic cavity. It is filled with hemolymph (the insect equivalent of blood) and is crucial for the circulation of nutrients and waste.

3. **Role of Exoskeleton**: The exoskeleton of the cockroach, particularly in the abdominal region, is formed by hardened plates called sclerites. These sclerites provide structure and protection to the body.

4. **Movement Mechanism**: The sclerites are connected by flexible membranes known as articular membranes. These membranes allow for movement between the sclerites, facilitating the cockroach's mobility.

5. **Arrangement of Sclerites**: The sclerites are arranged in a plate-like structure, which allows for parallel movement and flexibility. The dorsal part is known as the tergum, while the ventral part is known as the sternum.

6. **Presence of Pleuron**: Between the tergum and sternum, there are narrow membranes called pleuron. These membranes play a significant role in the movement and flexibility of the cockroach's body.

7. **Conclusion**: The body cavity of the cockroach is formed by the arrangement of these sclerites and the presence of the hemocoel, which is supported by the exoskeleton and the associated membranes.

### Final Answer:
The body cavity of the cockroach is formed by the arrangement of hardened sclerites and the hemocoel, supported by the exoskeleton and flexible membranes.