Which one of the following is a matching set of a phylum and its three examples?

Options

A. Porifera : Spongilla, Euplectella,Pennatula
B. Cnidaria: Bonellia, Physalia, Aurelia
C. Platyhelminthes: Planaria, enterobius, Schistosoma
D. Mollusca : Loligo, Teredo, Octopus.

Answer

To solve the question of identifying the matching set of a phylum and its three examples, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Analyze Option A: Porifera**
- Examples given: Spondyla, Euplecta, and Panactula.
- Spondyla and Euplecta belong to Porifera, but Panactula (correctly referred to as Pennatula) belongs to Cnidaria.
- **Conclusion**: Option A is incorrect.

2. **Analyze Option B: Cnidaria**
- Examples given: Nidelia, Bonelia, Phycelia, and Aurelia.
- Physalia and Aurelia are indeed part of Cnidaria, but Bonelia belongs to Annelida.
- **Conclusion**: Option B is incorrect.

3. **Analyze Option C: Platyhelminthes**
- Examples given: Planaria, Enterobius, and Psychostoma.
- Planaria and Psychostoma belong to Platyhelminthes, but Enterobius belongs to Nematoda (also known as Aschelminthes).
- **Conclusion**: Option C is incorrect.

4. **Analyze Option D: Mollusca**
- Examples given: Loligo, Pterido, and Octopus.
- All three examples (Loligo, Pterido, and Octopus) belong to the phylum Mollusca.
- **Conclusion**: Option D is correct.

### Final Answer:
The matching set of a phylum and its three examples is **Option D: Mollusca, Loligo, Pterido, and Octopus.**

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