Which one of the following animals is diploblastic

Options

A. Pennatula
B. Paramoecium
C. Taenia solium
D. Ascaris

Answer

To determine which of the given animals is diploblastic, we need to understand what diploblastic means. Diploblastic animals have two primary germ layers: the ectoderm and the endoderm. Let's analyze the options provided step by step.

### Step-by-Step Solution:

1. **Understand Diploblastic Animals**:
- Diploblastic animals are characterized by having two germ layers: ectoderm (outer layer) and endoderm (inner layer). Common examples include cnidarians like jellyfish and corals.

2. **Evaluate Option 1: Tula (likely meant to be "Hydra")**:
- Hydra is a cnidarian and is indeed diploblastic. It has both ectoderm and endoderm layers.
- **Conclusion**: This option is correct.

3. **Evaluate Option 2: Paramecium**:
- Paramecium is a unicellular organism and does not have germ layers like multicellular animals. It is not classified as diploblastic.
- **Conclusion**: This option is incorrect.

4. **Evaluate Option 3: Teniosoleum**:
- Teniosoleum is a type of flatworm and is triploblastic, meaning it has three germ layers: ectoderm, endoderm, and mesoderm.
- **Conclusion**: This option is incorrect.

5. **Evaluate Option 4: Ascaris**:
- Ascaris is a roundworm and is also triploblastic, having ectoderm, endoderm, and mesoderm.
- **Conclusion**: This option is incorrect.

### Final Answer:
The only animal that is diploblastic among the given options is **Tula (Hydra)**.

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