If a food particle is placed near the osculum of a sponge then it will

Options

A. Be thrown away
B. Be ingested
C. Rotate round osculum
D. Be ingested first and then thrown out through ostia

Answer

To answer the question "If a food particle is placed near the osculum of a sponge then it will," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure of a Sponge**:
- Sponges have a unique body structure with numerous pores (ostea) and a larger opening called the osculum. Water enters the sponge through the ostia and exits through the osculum.

2. **Function of the Osculum**:
- The osculum serves as the main exit point for water that has been filtered by the sponge. It is important to note that the osculum does not function as an entry point for food particles.

3. **Placement of Food Particle**:
- If a food particle is placed near the osculum, it is important to understand that the osculum is designed to expel water and any particles that may be near it.

4. **Outcome of Food Particle Near Osculum**:
- Since the osculum expels water, any food particle that is placed near it will likely be carried away with the outgoing water flow. Thus, the food particle will be thrown out of the sponge.

5. **Conclusion**:
- Therefore, the correct answer is that if a food particle is placed near the osculum of a sponge, it will be thrown away.

### Final Answer:
If a food particle is placed near the osculum of a sponge, then it will be thrown away.

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