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Question

The characteristic that is shared by urea, uric acid and ammonia are

I. They are nitrogenous wastes
II. They all need a very large amount of water for excretion
III. They are all equally toxic
IV. They are produced in the kidneys

A
I and II
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B
I and IV
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C
I, II and IV
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D
Only I
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Solution

The correct option is B I and IV

Urea, uric acid, and ammonia all are nitrogenous wastes produced by kidneys.

Ammonia is highly toxic and highly soluble in water, therefore, it requires a large amount of water for its elimination, while urea is less toxic and less soluble in water than ammonia and uric acid are least toxic and can be removed with least amount of water.

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