Question

The characteristic(s) 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 excretory products and are nitrogenous. Ammonia is highly toxic and is highly soluble in water. Therefore, it requires a large amount of water for excretion. Urea is less toxic and is less soluble in water than ammonia. Uric acid crystals are non-toxic and almost insoluble in water. The level of toxicity and the amount of water needed for their elimination differs for each of them.