Animal KingdomHard

Question

Presence of gills in the tadpole of frog indicates the

Options

A.fishes were amphibious in the past
B.fishes evolved from frog like ancestors
C.frogs will have gills in future
D.frogs evolved form gilled ancestors

Solution

According to biogenetic law of Ernst Haeckel (1860) Ontogeny repeats Phylogeny. Ontogeny is the life history of an organism while phylogeny history of the race of that organism. In other words we can say “an organism repeats its ancestral history during its development”. Hence, resemblance of Amphibia to fish is seen in most systems of the body, both are cold-blooded, both respire by eills (as tadpole of frog), usually lay eggs in water leading to the conclusion that amphibians have originaed from fishes.

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