Question

Similarity between fish and tadpole is
A) Legs
B) Fins
C) Lateral line
D) Scales

Answer 1

Hint:Fish and tadpoles belong to two completely different classes. Both are chordates, but tadpoles, which are juvenile frogs, belong to the class Amphibia, while fish belong to three different classes depending on whether they are bony or cartilaginous.

Complete answer:
>Legs are not found either in tadpoles or fish. Fish have fins that are used for mobility. Tadpoles do grow legs as they metamorph into adult frogs or toads. However, these do not apply to the tadpole itself. Option A is incorrect
>Fish have fins, used for mobility and stability. Tadpoles also have a tail with a fin on it but this is structurally different from that of the fish. It is a simple layer of skin crisscrossed by collagen to provide stiffness and stability, while the fins of a fish have a bony or cartilaginous support structure. Option B is incorrect.
>The lateral line system is found in water-dwelling vertebrates, including fish and amphibians. This is a sense organ that detects both movement as well as changes in pressure in the water around the animal. Option C is correct.
>Tadpoles have a smooth skin, while fish have scales. Option D is incorrect. Interestingly tadpoles also breathe through gills, just like fish do.

Hence the correct answer is option ‘C’.

Note:The lateral line system is a nervous organ containing mechanoreceptors called neuromasts. They are found in lateral line canals just under the skin. While fish retain their lateral line system throughout their lives, adult amphibians that do not live in water will lose this system.