Which of the following phylum have radially symmetrical organisms?

Options

A. Coelenterata
B. Platyhelminthes
C. Aschelminthes
D. Annelida

Answer

To determine which phylum has radially symmetrical organisms, we can analyze the options provided and understand the characteristics of each phylum.

### Step-by-Step Solution:

1. **Understanding Radial Symmetry**:
- Radial symmetry means that the organism can be divided into similar halves by multiple planes passing through the central axis. Common examples include jellyfish and sea anemones.

2. **Analyzing the Options**:
- **Option 1: Cnidaria**:
- Cnidarians, such as jellyfish and corals, exhibit radial symmetry. They can be divided into similar halves from multiple planes. Therefore, this option is correct.

- **Option 2: Platyhelminthes**:
- Platyhelminthes, or flatworms, are bilaterally symmetrical. They can only be divided into two similar halves along one plane. Thus, this option is incorrect.

- **Option 3: Aschelminthes**:
- Aschelminthes, which include roundworms, also display bilateral symmetry. They cannot be divided into similar halves from multiple planes. Therefore, this option is incorrect.

- **Option 4: Annelida**:
- Annelids, such as earthworms and leeches, are bilaterally symmetrical as well. They can only be divided into two equal halves along one plane. Hence, this option is incorrect.

3. **Conclusion**:
- Based on the analysis, the only phylum that has radially symmetrical organisms is **Cnidaria**. Therefore, the correct answer is **Option 1**.

### Final Answer:
**The phylum that has radially symmetrical organisms is Cnidaria (Option 1).**

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