Select the correct match about vertebrates with their features :

Options

A. Teeth of Scoliodon `rarr` modified cycloid scales
B. Electric organ of Torpedo `rarr` modified muscles on dorsal side
C. Sting of Trygon`rarr` modified pelvic fin
D. All of the above

Answer

To solve the question of matching vertebrates with their features, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Evaluate the First Option: Scoliodon and Modified Cycloid Scales**
- Scoliodon is a type of shark, which is a marine fish.
- Marine fish like Scoliodon possess **placoid scales**, not cycloid scales.
- **Conclusion**: This option is incorrect.

2. **Evaluate the Second Option: Electric Organ of Torpedo and Modified Muscle on Dorsal Side**
- The electric organ in Torpedo (a type of electric ray) is indeed a modified muscle.
- These electric organs are located on the dorsal side and serve as defense mechanisms by delivering electric shocks.
- **Conclusion**: This option is correct.

3. **Evaluate the Third Option: Strings of Trigon and Modified Pelvic Fins**
- Trigon refers to the stingray, which has modified pectoral fins.
- The statement claims they have modified pelvic fins, which is incorrect.
- **Conclusion**: This option is incorrect.

4. **Final Conclusion**:
- The only correct match is the **Electric Organ of Torpedo**, which is a modified muscle located on the dorsal side.

### Final Answer:
The correct match about vertebrates with their features is the **Electric Organ of Torpedo - Modified Muscle on Dorsal Side**.

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