If a carmine particle is put on the osculum of living spong it will

Options

A. Be ingested
B. Be thrown away
C. Rotate
D. Adhere

Answer

### Step-by-Step Solution:

1. **Understanding the Structure of a Sponge**:
- The osculum is a large opening at the top of a sponge through which water exits after passing through the sponge's body. It serves as the outlet for the water that has been filtered by the sponge.

2. **Identifying the Carmine Particle**:
- Carmine particles are red pigment particles derived from carminic acid, which is often used in various applications due to its vivid color. These particles are relatively large compared to the size of food particles that sponges typically filter.

3. **Interaction of the Carmine Particle with the Osculum**:
- When a carmine particle is placed on the osculum of a living sponge, it attempts to enter the sponge through the osculum. However, due to its larger size, it cannot be ingested by the sponge.

4. **Role of Coenocytes**:
- Coenocytes are specialized cells within the sponge that help in the feeding process. They have flagella that create water currents and help in filtering food particles from the water. When the carmine particle reaches the coenocytes, they recognize that it is too large to be ingested.

5. **Outcome**:
- Since the carmine particle is too large, the coenocytes will reject it. Therefore, the carmine particle will not be taken in by the sponge and will be expelled or thrown away.

### Final Answer:
If a carmine particle is put on the osculum of a living sponge, it will be thrown away because it is too large for the sponge to ingest.