Fresh water sponge is :-

Options

A. Spongilla
B. Scypha
C. Euspongia
D. Leucosolenia

Answer

To determine which sponge is a freshwater sponge, we will analyze the given options step by step.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- Option 1: Spongilla
- Option 2: Scypha
- Option 3: Uspongia
- Option 4: Leukoselenia

2. **Evaluate Option 1 - Spongilla**:
- Spongilla is known to be a genus of freshwater sponges.
- It belongs to the family Spongillidae and is commonly found in lakes and slow-moving streams.
- **Conclusion**: This option is likely correct.

3. **Evaluate Option 2 - Scypha**:
- Scypha, also known as Sycon, is a genus of marine sponges.
- It belongs to the class Calcarea, which primarily includes marine species.
- **Conclusion**: This option is incorrect.

4. **Evaluate Option 3 - Uspongia**:
- Uspongia is another term used for marine sponges.
- It does not belong to the freshwater category.
- **Conclusion**: This option is incorrect.

5. **Evaluate Option 4 - Leukoselenia**:
- Leukoselenia is a genus of calcareous sponges, which are also primarily marine.
- **Conclusion**: This option is incorrect.

6. **Final Conclusion**:
- After evaluating all options, the only freshwater sponge among the choices is **Spongilla** (Option 1).

### Final Answer:
The freshwater sponge is **Spongilla**.

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