Question

Presence of gills in tadpole of frog indicates that

• A. Frog will have gills in future.
• B. Frog evolved from gilled ancestors.
• C. Fishes were amphibians in the past.
• D. Fishes evolved from frog-like ancestors.

Answer 1

Answer: (B)

Frog evolved from gilled ancestors.

Tadpoles are the larval structure of frog. They respire through gills whereas the frogs respire through the skin and lungs.

Since, fishes also respires through gills. Hence, presence of gills in the tadpole indicates that frogs are evolved from fishes.

So the correct answer is 'Frog evolved from gilled ancestors'.