Lateral line sense organs occur in

Options

A. Cartilaginous fishes
B. Bony fishes
C. Amphibian larvae
D. Reptiles

Answer

### Step-by-Step Solution:

1. **Understanding Lateral Line Sense Organs**:
- Lateral line sense organs are specialized sensory structures that help aquatic animals detect movement and vibrations in the water. They are composed of a series of sensory cells that can respond to changes in water pressure and movement.

2. **Identifying the Organ Composition**:
- These organs are derived from epidermal cells, which means they originate from the outer layer of skin in these animals.

3. **Function of Lateral Line Organs**:
- The primary function of the lateral line system is to respond to stimuli caused by motion in the water, including the detection of electric impulses. This is crucial for navigation, hunting, and avoiding predators.

4. **Occurrence in Different Groups**:
- Lateral line sense organs are predominantly found in aquatic animals. They are present in both cartilaginous fishes (like sharks and rays) and bony fishes (like trout and goldfish).
- However, they are also present in the larvae of amphibians, which are typically aquatic.

5. **Evaluating the Options**:
- The question provides four options: cartilaginous fishes, bony fishes, amphibians, and larvae of reptiles.
- While cartilaginous and bony fishes possess lateral line systems, the question specifically mentions "occur" which suggests a focus on the developmental stage.

6. **Conclusion**:
- Given that lateral line sense organs are found in the larvae of amphibians and fishes, the best answer to the question is "larvae of amphibians".

### Final Answer:
- Lateral line sense organs occur in the larvae of amphibians.