Assertion : Spongocoel of the sponges is also called paragastric cavity.
Trophocytes are present in the spongocoel and release digestive enzym outside, causing the digestion of food in spongocoel.

Options

A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B. If both Assertion and Reason are true ,but the Reason is not the correct explanation of the Assertion.
C. If Assertion is true, but Reason is false
D. If both Assertion and Reason are false.

Answer

To solve the question, we need to analyze both the assertion and the reason provided in the statement.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that the spongocoel of sponges is also called the paragastric cavity.
- The spongocoel is indeed a large central cavity in sponges where water circulates. It is correct to refer to it as the paragastric cavity because it serves a similar function to a digestive cavity in other animals.

2. **Understanding the Reason**:
- The reason states that trophocytes are present in the spongocoel and release digestive enzymes outside, causing the digestion of food in the spongocoel.
- Trophocytes are not the primary cells responsible for digestion in sponges. Instead, the role of releasing digestive enzymes and facilitating digestion is primarily performed by choanocytes (flagellated cells). Therefore, the reason provided is incorrect.

3. **Conclusion**:
- Since the assertion is true (the spongocoel can be referred to as the paragastric cavity), but the reason is false (trophocytes do not release digestive enzymes), we conclude that the answer to the question is that the assertion is true, but the reason is false.

### Final Answer:
- The correct option is C: Assertion is true, but the reason is false.