204
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.
(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.
(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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