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Question

Whales belong to class Mammalia. Mammals are basically terrestrial. Mention the important changes that have occurred in whales which enable them to lead an aquatic life.

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Solution

Important changes in whales to lead aquatic life are as follows:

(a) Fusiform tapering body.
(b) Horizontally expanded tail for propulsion.
(c) Formation of a thick layer of fat beneath the skin, the blubber.
(d) Presence of whale bone or baleen.
(e) Absence of external ear, nostrils moved to the apex of the head.

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