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KCET · BIOLOGY · STD 11 - 16. Excretory Products and their Elimination

The characteristic that is shared by urea, uric acid and ammonia is/are
(A) They are nitrogenous wastes.
(B) They all need very large amount of water is excretion.
(C) They all are equally toxic.
(D) They are produced in the kidneys.

  1. A A, C and D
  2. B A only
  3. C A and C
  4. D A and D
Verified Solution

Answer & Solution

Correct Answer

(B) A only

Step-by-step Solution

Detailed explanation

(B) A only,
Urea, uric acid, and ammonia are all nitrogenous wastes derived from protein metabolism. They have different toxicity--ammonia being the most toxic, followed by urea, and uric acid is the least toxic. Ammonia requries a large amount of water for excretion. Urea is produced in the liver.