Mark the correct matching set

Options

A. Parenchymula-larva of sponges
B. Amphiblastula-larva of coelenterates
C. Sycon-crumb of bread sponge
D. Halichondria -urn sponge

Answer

To solve the question of marking the correct matching set, let's analyze each option step by step:

### Step 1: Analyze the first option - Parenchymeula
- **Definition**: Parenchymeula is known as a larval stage of sponges.
- **Conclusion**: This statement is correct.

### Step 2: Analyze the second option - Amphiblastula
- **Definition**: Amphiblastula is a type of larval stage, but it is associated with sponges, not ciliates.
- **Conclusion**: This statement is incorrect.

### Step 3: Analyze the third option - Helichondria
- **Definition**: Helichondria is often referred to as the "crumb of bread" sponge, not the urn sponge.
- **Conclusion**: This statement is incorrect.

### Step 4: Analyze the fourth option - Cycan
- **Definition**: Cycan is not a recognized term in the context provided, and it seems to be a mislabeling or confusion with Helichondria.
- **Conclusion**: This statement is incorrect.

### Final Conclusion
- The only correct matching set is **Parenchymeula** as the larval stage of sponges. Therefore, the correct answer is **Option A**.