Question

Presence of gills in the tadpole of frog indicates
that
(a) fishes evolved from frog like ancestors
(b) frogs will have gills in future
(c) frogs evolved from gilled ancestors
(d) fishes were amphibious in the past

Answer 1

Presence of gills in the tadpole of frog indicates that 'frogs evolved from gilled ancestors'.

Option: C

Explanation:

• Usually tadpole is the term used for referring the larval stage in the life cycle of an amphibian, especially from a toad or frog.
• Most of the tadpoles are wholly aquatic. However, some of the tadpoles are terrestrial as well.
• As tadpoles are the larval structure of the frogs, they respire via gills. However, frogs respire through skin and lungs.
• As fishes are respired through gills, the presence of gills in tadpoles indicates that they are evolved from fishes.  
• Thus the answer will be ‘Frog is evolved from the gilled type ancestors’.

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