A) Urea excretion in mammals entails a greater loss of water than that in birds.
B) The water requirement per unit weight is less in birds than in mammals.
C) Absorption of water from the gut is more efficient in birds than in mammals.
D) None of these
Correct Answer: A
Solution :
(a and b) Urea excretion in mammals requires 20-40 times more water than is required to excrete a similar amount of uric acid in birds. That's why birds have a lower requirement of water than mammals.
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