Gemmule formation occurs in

Options

A. fresh water sponge
B. some marine spomges
C. Labeo rohita
D. Both (1) and (2)

Answer

### Step-by-Step Solution:

1. **Understanding Gemmule Formation**:
- Gemmules are reproductive structures that are involved in asexual reproduction. They are small, dormant, and seed-like.

2. **Identifying Organisms that Form Gemmules**:
- Gemmules are primarily found in certain species of sponges. Specifically, they are common in freshwater sponges and some marine sponges.

3. **Analyzing the Options**:
- The options provided are:
- Freshwater sponge
- Some marine sponges
- Labio rohita (a fish species)
- Both 1 and 2 (which refers to freshwater and marine sponges)

4. **Evaluating Each Option**:
- Freshwater sponge: Yes, they can produce gemmules.
- Some marine sponges: Yes, they can also produce gemmules.
- Labio rohita: No, this species reproduces sexually and does not form gemmules.

5. **Conclusion**:
- Since gemmules are found in both freshwater and some marine sponges, the correct answer is "both 1 and 2".

### Final Answer:
Gemmule formation occurs in both freshwater sponges and some marine sponges.

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