Which one of the following is a matching pair of a body feature and the animal possessing it?

Options

A. Ventral heart – Scorpion
B. Post-anal tail – Octopus
C. Ventral central – Leech nervous system
D. Pharyngeal gill slits – Chamaeleon Absent in embryo

Answer

To solve the question, "Which one of the following is a matching pair of a body feature and the animal possessing it?", we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Evaluate the First Option: Ventral Heart in Scorpion**
- Scorpions belong to the phylum Arthropoda.
- In scorpions, the heart is actually located dorsally, not ventrally.
- **Conclusion**: This option is incorrect.

2. **Evaluate the Second Option: Post-anal Tail in Octopus**
- Octopuses are classified under the phylum Mollusca.
- The post-anal tail is a characteristic feature of chordates (caudates) and is not present in octopuses.
- **Conclusion**: This option is also incorrect.

3. **Evaluate the Third Option: Ventral Central Nervous System in Leech**
- Leeches belong to the phylum Annelida.
- In annelids, including leeches, the central nervous system is indeed ventral.
- **Conclusion**: This option is correct.

4. **Evaluate the Fourth Option: Pharyngeal Gill Slits Absent in Chameleon Embryo**
- Chameleons are reptiles and belong to the category of chordates.
- Chordates typically have pharyngeal gill slits during their embryonic stage.
- If pharyngeal gill slits are absent in the embryo of a chameleon, this statement is incorrect.
- **Conclusion**: This option is incorrect.

### Final Answer:
The correct matching pair of a body feature and the animal possessing it is the **Ventral Central Nervous System in Leech**.

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