Which of the following is not correct w.r.t. the neural system of the insects ?

Options

A. The brain is present
B. The neural system of insects is simply composed of the network of neurons
C. The neural system fo insects is better organised than that of Hydra
D. A number of ganglia are present along with the neural tissues in insects

Answer

To solve the question "Which of the following is not correct with respect to the neural system of the insects?", we will analyze the statements provided and identify the incorrect one.

### Step-by-Step Solution:

1. **Understanding Insect Neural System**:
- Insects belong to the phylum Arthropoda, which has a well-developed nervous system. This includes a central nervous system (CNS) composed of various ganglia.

2. **Identifying the Components of the Insect Nervous System**:
- The central nervous system of insects includes:
- **Cerebral Ganglion** (also known as the brain or supraesophageal ganglion)
- **Sub-esophageal Ganglion**
- **Circumesophageal Connectives**
- **Double Ventral Cords**
- **Thoracic Ganglia** (3 pairs)
- **Abdominal Ganglia** (6 pairs)

3. **Analyzing Each Statement**:
- **Statement 1**: "The brain is present."
- This is correct as insects have a brain (cerebral ganglion).

- **Statement 2**: "The neural system of insect is simply composed of the network of neurons."
- This statement is incorrect. The insect nervous system is not just a simple network of neurons; it consists of multiple ganglia and a complex structure.

- **Statement 3**: "The neural system of insects is better organized than that of Hydra."
- This is correct. Hydra has a simple nerve net, while insects have a more complex and organized nervous system.

- **Statement 4**: "A number of ganglia present along with the neural tissues in insects."
- This is also correct, as insects have numerous ganglia throughout their body.

4. **Conclusion**:
- The incorrect statement regarding the neural system of insects is **Statement 2**: "The neural system of insect is simply composed of the network of neurons."

### Final Answer:
The statement that is not correct with respect to the neural system of insects is: **"The neural system of insect is simply composed of the network of neurons."**

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