Nematocysts of hydra are derived from

Options

A. Digestive cells
B. interstitial cells
C. musculo-epithelial cells
D. mesogloea

Answer

To determine the origin of nematocysts in Hydra, we can follow these steps:

### Step-by-Step Solution:

1. **Understand what Nematocysts are**: Nematocysts are specialized cells found in members of the phylum Cnidaria, which includes Hydra. They are essentially stinging structures that contain venom and are used for capturing prey and defense.

2. **Identify the source of Nematocysts**: The question specifically asks where nematocysts are derived from in Hydra.

3. **Evaluate the options**:
- **Digestive Cells**: These cells are involved in the digestion of food and do not produce nematocysts. Thus, this option is incorrect.
- **Interstitial Cells**: These are undifferentiated cells found in the body of Hydra that can differentiate into various cell types, including nematocysts. This option is correct.
- **Musculoepithelial Cells**: Hydra does not have a complex muscular structure, and these cells are not responsible for forming nematocysts. Therefore, this option is incorrect.
- **Mesoglia**: This is a gelatinous substance found in the body of some organisms, primarily in the phylum Porifera, and does not relate to the formation of nematocysts in Hydra. Hence, this option is also incorrect.

4. **Conclusion**: Based on the evaluation, the correct answer is that nematocysts of Hydra are derived from **interstitial cells**.

### Final Answer:
Nematocysts of Hydra are derived from interstitial cells.

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