Diploblastic animal with radial symmetry is

Options

A. Roundworm
B. Earthworm
C. Liver fluke
D. Hydra

Answer

To solve the question "Diploblastic animal with radial symmetry is?", we can follow these steps:

### Step 1: Understand the Terms
- **Diploblastic Animals**: These animals have two germ layers: the outer ectoderm and the inner endoderm. They do not have a mesoderm.
- **Radial Symmetry**: This type of symmetry means that the body parts are arranged around a central axis. An example of this can be seen in organisms like jellyfish and sea anemones.

### Step 2: Analyze the Options
1. **Roundworm**: This organism belongs to the phylum Aschelminthes and is triploblastic (having three germ layers: ectoderm, mesoderm, and endoderm) with bilateral symmetry.
2. **Earthworm**: This organism belongs to the phylum Annelida and is also triploblastic with bilateral symmetry.
3. **Liver Fluke**: This organism belongs to the phylum Platyhelminthes and is triploblastic with bilateral symmetry.
4. **Hydra**: This organism belongs to the phylum Coelenterata (or Cnidaria) and is diploblastic with radial symmetry.

### Step 3: Identify the Correct Answer
From the analysis:
- The first three options (roundworm, earthworm, liver fluke) are triploblastic and have bilateral symmetry.
- The last option, **Hydra**, is the only one that is diploblastic and exhibits radial symmetry.

### Conclusion
The correct answer to the question "Diploblastic animal with radial symmetry is?" is **Hydra**.

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