Lateral line system found in fish has been lost in amphibians due to

Options

A. Development of limbs
B. Change over to herbivorous feeding
C. Occurrence of metamorphosis in frog
D. Evolution of terrestrial habit

Answer

**Step-by-Step Solution:**

1. **Understanding the Lateral Line System:**
- The lateral line system is a sensory organ found in aquatic vertebrates, including fish. It helps these organisms detect movement and pressure changes in the water, functioning as a tactile sense organ.

2. **Presence in Fish:**
- In fish, the lateral line system is crucial for survival as it allows them to navigate their aquatic environment, find food, and avoid predators.

3. **Transition to Amphibians:**
- Amphibians, such as frogs, undergo a life cycle that includes both aquatic (larval) and terrestrial (adult) stages. While the larval forms live in water and may possess the lateral line system, the adult forms are primarily terrestrial.

4. **Loss of the Lateral Line System:**
- The lateral line system is not necessary for terrestrial life. As amphibians evolved to adapt to land, the need for this sensory system diminished, leading to its loss in adult forms. This adaptation to a terrestrial habitat is the primary reason for the absence of the lateral line system in amphibians.

5. **Analyzing the Options:**
- The question provides several options for why the lateral line system was lost in amphibians:
- A) Development of limbs: Incorrect, as limbs do not directly relate to the sensory system.
- B) Change over to herbivorous feeding: Incorrect, as feeding habits do not influence the lateral line system.
- C) Occurrence of metamorphosis in frogs: Incorrect, while metamorphosis is a significant life stage, it is not the direct cause of losing the lateral line system.
- D) Evolution of terrestrial habitat: Correct, as the adaptation to living on land eliminated the need for the lateral line system.

6. **Conclusion:**
- The correct answer is that the lateral line system has been lost in amphibians due to their evolution and adaptation to a terrestrial habitat.

---