The nervous system in cockroach

Options

A. Is spread throughout the body
B. Is represented by segmentally arranged ganglia and ventral never cord
C. Both a and b are correct
D. Consists of supra-oesopharyngeal ganglia in head and dorsal nerve cord

Explanation

### Step-by-Step Solution:

1. **Understanding the Nervous System in Cockroach**: The nervous system of a cockroach is a complex structure that is essential for coordinating its movements and responses to the environment.

2. **Structure of the Nervous System**: The cockroach nervous system is primarily composed of a ventral nerve cord and segmentally arranged ganglia. This is different from the dorsal nerve cord found in other organisms.

3. **Ventral Nerve Cord**: The ventral nerve cord runs along the belly of the cockroach and is responsible for transmitting signals throughout the body. It is a key component of the cockroach's nervous system.

4. **Segmentally Arranged Ganglia**: The nervous system includes ganglia that are arranged segmentally. Each segment of the cockroach has a pair of ganglia that control the functions of that segment, allowing for coordinated movement and reflex actions.

5. **Supraesophageal Ganglia**: In addition to the ventral nerve cord and segmental ganglia, the cockroach has supraesophageal ganglia located in the head region. This structure acts as a brain, processing sensory information and coordinating responses.

6. **Conclusion**: Therefore, the nervous system in a cockroach is characterized by its spread throughout the body, represented by segmentally arranged ganglia and a ventral nerve cord. Both the presence of supraesophageal ganglia and the ventral nerve cord are important aspects of its structure.

### Final Answer:
The nervous system in cockroaches is spread out throughout the body and is represented by segmentally arranged ganglia and a ventral nerve cord. Both options A (supraesophageal ganglia in the head) and B (ventral nerve cord) are correct, making option C the correct answer.