Hydra reproduces sexually during

Options

A. Spring
B. Summer
C. Autumn
D. Winter.

Answer

### Step-by-Step Solution:

1. **Understanding Hydra's Reproduction**:
- Hydra is a member of the phylum Cnidaria and can reproduce both sexually and asexually.

2. **Identifying Reproductive Forms**:
- Hydra has two forms in its life cycle: the polyp and the medusa. The polyp can reproduce asexually, while the medusa is involved in sexual reproduction.

3. **Conditions for Sexual Reproduction**:
- Sexual reproduction in hydra typically occurs during unfavorable conditions, such as food scarcity or adverse environmental conditions.

4. **Seasonal Timing**:
- Specifically, hydra reproduces sexually during the winter season when conditions are less favorable for growth.

5. **Asexual Reproduction**:
- In contrast, during more favorable conditions, such as in spring and summer, hydra predominantly reproduces asexually through methods like budding or fragmentation.

6. **Conclusion**:
- Therefore, the correct answer to the question "Hydra reproduces sexually during" is **winter**.