Question

The characteristic that is shared by Urea, Uric Acid and Ammonia are:
(1) they are the nitrogenous waste.
(2) they all need a very large amount of water for excretion.
(3) they all are equally toxic.
(4) they are produced in kidneys.

• A. 1 only
• B. 1 and 3
• C. 1 and 4
• D. 1, 3 and 4

Answer 1

The correct option is A 1 only

Urea, uric acid, and ammonia are all nitrogenous wastes.
Ammonia is more water soluble and also more toxic than either urea or uric acid.
Ammonia is highly toxic, followed by urea and uric acid is least toxic. Ammonia is converted into urea in the liver by deamination.
There are certain organisms which lose the metabolic wastes through their body by diffusion. It includes sponges, coelenterates, and echinoderms. There are flame cells which help in excretion and occur in flatworms. The excretory system is unique in roundworms which contain canals and tube. Annelids have nephridia as their excretory organ. Arthropods have Malpighian tubules as their excretory organ. Prawns have green glands for excretion and vertebrates have kidneys as their excretory organ.