Which one is correctly matched?

Options

A. Scorpion, spider, cockroach - Ventral solid central nervous system
B. Cockroach, Locust, Taenia - Metameric segmentation
C. Liver fluke, Sea anemone, Sea cucumber Bilateral symmetry
D. Centipede, Prawn, Sea urchin - Jointed appendages

Answer

To determine which option is correctly matched, we need to analyze each option based on the characteristics of the organisms mentioned.

### Step-by-Step Solution:

1. **Analyze the First Option: Scorpion, Spider, Cockroach - Ventral Solid Central Nervous System**
- **Explanation**: Scorpions, spiders, and cockroaches all belong to the phylum Arthropoda. They possess a ventral solid central nervous system, which includes a double solid or mid-ventral nerve cord.
- **Conclusion**: This option is correctly matched.

2. **Analyze the Second Option: Cockroach, Locust, Taenia - Metameric Segmentation**
- **Explanation**: Cockroaches and locusts exhibit metameric segmentation, which is the repetition of body segments. However, Taenia (tapeworm) is not segmented in the same way; it is unsegmented.
- **Conclusion**: This option is incorrectly matched.

3. **Analyze the Third Option: Liver Fluke, C. Anemone, C. Cucumber - Bilateral Symmetry**
- **Explanation**: The liver fluke does exhibit bilateral symmetry. However, C. anemone (sea anemone) and C. cucumber (sea cucumber) are echinoderms, which exhibit radial symmetry.
- **Conclusion**: This option is incorrectly matched.

4. **Analyze the Fourth Option: Centipede, Prawn, Sea Urchin - Jointed Appendages**
- **Explanation**: Centipedes and prawns have jointed appendages as they belong to the phylum Arthropoda. However, sea urchins do not have jointed appendages; they have tube feet for locomotion and belong to the phylum Echinodermata.
- **Conclusion**: This option is incorrectly matched.

### Final Conclusion:
The only correctly matched option is the first one: **Scorpion, Spider, Cockroach - Ventral Solid Central Nervous System**.

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