Which group does not contain polyp?

Options

A. Hydrozoa
B. Scyphozoa
C. Anthozoa
D. Calcarea.

Answer

To solve the question "Which group does not contain polyp?", we will analyze the options provided and understand the characteristics of each group.

### Step-by-Step Solution:

1. **Understand the Phylum Cnidaria**:
- Cnidarians are known for having two main body forms: the polyp and the medusa.
- The polyp form is typically sessile (attached to a surface), while the medusa form is free-swimming.

2. **Identify the Options**:
- The options given are Hydrozoa, Scyphozoa, Anthozoa, and Calcarea.

3. **Analyze Each Option**:
- **Hydrozoa**: This class includes both polyp and medusa forms. Therefore, it contains polyps.
- **Scyphozoa**: This class primarily consists of medusa forms, but it also has a polyp stage in its life cycle. Thus, it contains polyps.
- **Anthozoa**: This class is exclusively polyp; it does not have a medusa stage. Hence, it contains polyps.
- **Calcarea**: This class belongs to the Phylum Porifera (sponges) and does not have a polyp form at all.

4. **Conclusion**:
- Since Calcarea is the only group that does not contain the polyp form, the answer to the question is **Calcarea**.

### Final Answer:
The group that does not contain polyp is **Calcarea**.