Animal with unsegmented, coelomated and radially symmetrical body having distinct oral and aboral surfaces belong to

Options

A. Annelida
B. Molluscs
C. Echinodermate
D. Porifera

Answer

To solve the question "Animal with unsegmented, coelomated and radially symmetrical body having distinct oral and aboral surfaces belong to?", we can follow these steps:

### Step 1: Understand the Key Terms
- **Unsegmented**: This means the body does not have segments or divisions.
- **Coelomated**: This indicates that the organism has a true body cavity, known as a coelom.
- **Radially symmetrical**: This means that the organism can be divided into similar halves by multiple planes passing through the central axis.
- **Distinct oral and aboral surfaces**: This means the organism has a clear mouth (oral) and opposite end (aboral).

### Step 2: Analyze the Options
1. **Annelida**:
- Annelids are segmented (e.g., earthworms) and exhibit bilateral symmetry, not radial symmetry. Therefore, this option is incorrect.

2. **Mollusca**:
- Mollusks can be unsegmented and coelomated, but they typically exhibit bilateral symmetry rather than radial symmetry. Thus, this option is also incorrect.

3. **Echinodermata**:
- Echinoderms (e.g., starfish, sea urchins) are indeed unsegmented, coelomated, and exhibit radial symmetry as adults. They also have distinct oral and aboral surfaces. This option fits all the criteria.

4. **Porifera**:
- Poriferans (sponges) are not coelomated, do not have a true body cavity, and are asymmetrical. They also lack distinct oral and aboral surfaces. Hence, this option is incorrect.

### Step 3: Conclusion
Based on the analysis, the correct answer is **Echinodermata**.

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