The "nervous system " of Hydra consists of

Options

A. Polarized nerve cells
B. nonpolarized nerve cells
C. well defined nerves
D. ganglionated nerve cord

Answer

To solve the question regarding the nervous system of Hydra, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Hydra's Nervous System**:
- Hydra is a simple organism belonging to the phylum Cnidaria.
- Its nervous system is not centralized like that of higher animals.

2. **Types of Nerve Cells**:
- Hydra contains non-polarized nerve cells, which are different from polarized nerve cells found in higher organisms.
- Non-polarized nerve cells are spread throughout the body of Hydra, forming a network.

3. **Structure of the Nervous System**:
- The nerve cells in Hydra do not form well-defined nerves or ganglionated nerve cords.
- Instead, they create a diffuse nerve net that allows for communication and response to stimuli.

4. **Connection to Sensory Cells**:
- The nerve cells are connected to photoreceptor cells (sensitive to light) and touch-sensitive cells, particularly in the tentacles.
- This network enables Hydra to respond to environmental stimuli effectively.

5. **Conclusion**:
- Based on the characteristics of Hydra's nervous system, the correct answer to the question is that the nervous system of Hydra consists of non-polarized nerve cells.

### Final Answer:
The nervous system of Hydra consists of **non-polarized nerve cells**.

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