The mode of digestion in sponges is

Options

A. Intracellular
B. Intercellular
C. Intracellular and intercellular
D. None of these

Answer

### Step-by-Step Solution:

1. **Identify the Organism**: The question asks about the mode of digestion in sponges, which belong to the phylum Porifera.

2. **Understand the Type of Digestion**: In sponges, digestion occurs intracellularly. This means that the digestion of food takes place inside the cells rather than in a digestive cavity.

3. **Role of Specialized Cells**: The collar cells, also known as choanocytes, play a crucial role in the digestion process. They trap food particles from the water that flows through the sponge.

4. **Digestion Process**: Once the food particles are trapped by the choanocytes, they are engulfed and digested within these cells. This process is essential for the sponge's nutrient acquisition.

5. **Additional Cell Types**: Besides choanocytes, pinacocytes (another type of cell in sponges) can also digest food particles that are too large to enter the ostium (the openings through which water flows into the sponge).

6. **Conclusion**: Therefore, the mode of digestion in sponges is intracellular, primarily facilitated by choanocytes and, to some extent, by pinacocytes.

### Final Answer:
The mode of digestion in sponges is intracellular.

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