Germ cells of Hydra are

Options

A. Ectodermal
B. Mesodermal
C. Endodermal
D. None of the above.

Answer

To answer the question "Germ cells of Hydra are," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**:
- Hydra is a freshwater organism belonging to the phylum Cnidaria. It is known for its simple body structure and regenerative abilities.

2. **Understand the Germ Layers**:
- Hydra is classified as a diploblastic organism, which means it has two primary germ layers: ectoderm and endoderm.

3. **Define Germ Cells**:
- Germ cells are the cells that give rise to gametes (sperm and eggs). In many organisms, these cells are derived from specific germ layers.

4. **Identify the Germ Layer Responsible for Germ Cells in Hydra**:
- In Hydra, the germ cells are derived from the ectoderm. The ectoderm is the outer layer that contributes to the formation of the reproductive cells.

5. **Evaluate Other Options**:
- **Mesoderm**: Hydra does not have a mesoderm; thus, it cannot be the source of germ cells.
- **Endoderm**: While the endoderm plays a role in forming digestive and glandular structures, it does not give rise to germ cells in Hydra.

6. **Conclusion**:
- Therefore, the correct answer is that the germ cells of Hydra are ectodermal.

### Final Answer:
The germ cells of Hydra are ectodermal.