Find out the correct match in the following : Structure / Phylum / Function

Options

A. Setae / Cnidaria / Locomotion
B. Amoebocytes / Ctenophora / Defence
C. Parapodia / Annelida / Swimming
D. Sclerites / Mollusca / Respiration

Answer

To solve the question of matching structures with their respective phyla and functions, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Option 1: Setae, Cnidaria, Locomotion**
- **Analysis**: Setae are bristle-like structures found in certain animals. They are primarily associated with the phylum Annelida (e.g., earthworms). Cnidaria includes jellyfish and corals, which do not possess setae.
- **Conclusion**: This option is incorrect.

2. **Option 2: Amoebocytes, Stenophora, Defence**
- **Analysis**: Amoebocytes are specialized cells found in sponges, which belong to the phylum Porifera. Stenophora (or Ctenophora) includes comb jellies, which do not have amoebocytes.
- **Conclusion**: This option is incorrect.

3. **Option 3: Parapodia, Annelida, Swimming**
- **Analysis**: Parapodia are lateral appendages found in many annelids, particularly aquatic species like Nereis. These structures are used for swimming and locomotion.
- **Conclusion**: This option is correct.

4. **Option 4: Sclerites, Mollusca, Respiration**
- **Analysis**: Sclerites are hard structures found in some animals, such as arthropods (e.g., cockroaches), which belong to the phylum Arthropoda. Mollusca, on the other hand, typically use gills for respiration.
- **Conclusion**: This option is incorrect.

### Final Answer:
The correct match is **Parapodia, Annelida, Swimming**.