Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
In Cetacea, due to aquatic mode of life, which of the following characteristics are the adaptations that have taken place? (1) Loss of hair on the skin (2) Loss of sweat glands (3) Presence of thick blubber (4) Presence of swim bladderA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: A
Solution :
Cetacea is the order of Mammalia. Their hairy covering of the skin is reduced to few bristles on the muzzle and this adaptation reduces resistance during swimming. Sweat glands are not present. Blubber is a thick layer of fat m present beneath the skin. Their bones of skull are spongy and contain fat. Dorsal and tail fins have no skeletal elements, eg, whales, dolphins.
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