Larval form found in sponges is

Options

A. Planula
B. Parenchymula
C. Cysticercus
D. Glochidium

Answer

To determine the larval form found in sponges, we can analyze the options provided:

1. **Planula**: This larval form is not found in sponges. Instead, it is commonly associated with organisms in the phylum Cnidaria, such as jellyfish.

2. **Parenchymula**: This is the correct answer. The Parenchymula is indeed the larval form found in sponges. It is a solid, multicellular larval stage that is characteristic of many sponge species.

3. **Cysticercus**: This option is incorrect. Cysticercus refers to the larval stage of tapeworms, specifically the young form of the tapeworm, which is not related to sponges.

4. **Glaucidium**: This option is also incorrect. Glaucidium is a larval form associated with freshwater mussels, not sponges.

Based on this analysis, the correct answer to the question "Larval form found in sponges is" is **Parenchymula**.

### Step-by-Step Solution:
1. **Identify the Options**: Review the provided options for the larval forms.
2. **Analyze Each Option**:
- **Planula**: Not found in sponges; associated with Cnidaria.
- **Parenchymula**: Correct; it is the larval form of sponges.
- **Cysticercus**: Incorrect; it is the larval form of tapeworms.
- **Glaucidium**: Incorrect; it is a larval form of freshwater mussels.
3. **Select the Correct Answer**: Based on the analysis, the correct answer is **Parenchymula**.