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Question

When compared to the mammals, birds are less sensitive to temporary deprivation of water, because

A
Urea excretion in mammals entails a greater loss of water than that in birds
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B
Absorption of Water horn the gut is more efficient in birds that in mammals
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C
The water requirement per unit weight is less in birds than in mammal
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D
None of these.
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Solution

The correct option is A Urea excretion in mammals entails a greater loss of water than that in birds
Birds and reptiles have uric acid as their nitrogenous waste.
The uricotelic organism excretes uric acid in form of a white paste or powder.
this uric acid is advantaged over the urea which is excreted in mammals in certain ways because it is less toxic and reduces water loss and thus it also reduces the need for water for excretion.

So, the correct option is 'Urea excretion in mammals entails a greater lass of water than that M birds'

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