Germ cells in Hydra are derived from

Options

A. Ectoderm
B. Mesoderm
C. Endoderm
D. Mesoglea

Answer

### Step-by-Step Solution

1. **Identify the Organism**: The question asks about germ cells in Hydra, which is a member of the phylum Cnidaria (also known as Coelenterata).

2. **Understand the Germ Layers**: Hydra is classified as a diploblastic organism. This means it has two primary germ layers:
- **Epidermis (or Aquoderm)**: The outer layer.
- **Gastrodermis (or Endoderm)**: The inner layer.

3. **Note the Absence of Mesoderm**: In Hydra, there is no mesoderm present, which is why it is termed diploblastic. The mesoderm is typically the third germ layer found in triploblastic organisms.

4. **Identify the Source of Germ Cells**: Germ cells in Hydra are derived from the outer layer, which is the epidermis (Aquoderm).

5. **Conclusion**: Therefore, the correct answer to the question is that germ cells in Hydra are derived from the Aquoderm.

### Final Answer
Germ cells in Hydra are derived from the Aquoderm (epidermis).

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