Question

Ureotelic animals
A. Lack urease
B. Do not excrete urea
C. Cannot form uric acid
D. Live in water.

Answer 1

Hint: Catabolism of protein and food digestion result in the formation of wastes that consists of various nitrogen-containing products, specifically ammonia, urea, and uric acid. Mammals, many terrestrial amphibians are ureotelic animals.

Complete answer:
To answer this question, we have to know about the process of excretion. The process by which metabolic waste products are eliminated from the body of animals is called excretion. Excretion and both are different processes; egestion is a removal of undigested food product from the body.

The composition of the nitrogen consisting of wastes like ammonia, urea, uric acid and their excretion differs among the different species, based on the availability of water. ammonia is a highly toxic form and requires a huge amount of water for its removal, uric acid being least toxic.

Now, let us find the solution from the option.
A ureotelic organism excretes excess nitrogen as urea. Urea is very less toxic than the ammonia eliminated by ammonotelic organisms. Examples of some ureotelic organisms are cartilaginous fish, few bony fishes, adult amphibians and mammals including humans.
The ureotelic animals lack urease enzyme, the enzyme which breaks urea into ammonia and carbon dioxide. The urease enzyme is present in bacteria, fungi and algae.

Thus, the correct answer is A, i.e. Lack of relief.

Note: Most frogs are ureotelic and can allow moderate dehydration without dying. Aquatic amphibians, such as Xenopus and almost all larvae, eliminate ammonia. At metamorphosis, the larvae of most species shift from eliminating ammonia to eliminating urea.