Lateral line sense organs are absent in

Options

A. Tadpole larva of frog
B. Fishes
C. Reptiles
D. Cartilaginous fishes

Answer

To determine which group lacks lateral line sense organs, we can analyze the options provided:

1. **Tadpole (larva of frog)**:
- Tadpoles are aquatic and belong to the amphibian class. They possess lateral line sense organs to help them detect movement and vibrations in water. Therefore, this option is incorrect.

2. **Fishes**:
- All fishes, whether they are bony (Osteichthyes) or cartilaginous (Chondrichthyes), have lateral line sense organs. These organs are crucial for their survival in aquatic environments as they help in sensing vibrations and changes in water pressure. Thus, this option is also incorrect.

3. **Cartilaginous fishes**:
- Cartilaginous fishes, such as sharks and rays, also possess lateral line sense organs. These organs help them navigate and hunt in their aquatic habitats. Therefore, this option is incorrect as well.

4. **Reptiles**:
- Reptiles are primarily terrestrial organisms. They do not have lateral line sense organs because they do not live in water where such sensory adaptations are necessary. This makes reptiles the correct answer.

**Final Answer**: Lateral line sense organs are absent in **reptiles**.