Question

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

(I) They are nitrogenous wastes.
(II) They all need a very large amount of water for excretion.
(III) They are equally toxic.
(IV) They are excretory products.

• A. I and III
• B. I and IV
• C. I, III and IV
• D. I only

Answer 1

The correct option is B I and IV

Urea, uric acid and ammonia are all nitrogenous wastes and excretory products. Ammonia is highly toxic and highly soluble in water, therefore, requires a large amount of water for excretion. Urea is less toxic and less soluble in water than ammonia. Uric acid crystals are non-toxic and almost insoluble in water. So their level of toxicity and the amount of water needed for their elimination differs for each of them.