Question

Animal which excrete urea produced during metabolism of amino acid is
A) Ureotelism
B) Uricotelism
C) Ammonotelism
D) Aminotelism

Answer 1

Urea is a colorless compound. They are crystalline in nature. Chemically urea consist of nitrogen, oxygen and carbon.

Complete answer:
Mammals including humans are the primary producers of urea in the body. Urea is generally produced as a metabolic byproduct of amino acid (protein) metabolism. And it is the primary nitrogenous waste product. Urea is usually produced in the liver.

Ureotelism: the elimination of the urea from an organism is generally known as ureotelism. And the animals that excrete their waste mainly in various forms of nitrogen such as urea are called ureotelic animals. Excretion occurs mainly through skin, kidney, and the lungs.
Uricotelism: it is the process of elimination of nitrogenous waste in the body. It is excreted mainly in the form of uric acid. The organism which eliminates uric acid is known as uricotelic. It is a common method which is seen in birds, land reptiles, and insects. Uric acid is formed from ammonia in the liver and some extent in the kidney.
Ammonotelism: it is the process of excretion of ammonia and ammonium ions. The animal which excrete ammonia is called ammonotelic. Ammonia is a highly toxic compound and must be excreted from the body through water. For this reason ammonotelism is mainly seen in aquatic animals.
Aminotelism: It is the process of excretion of amino acids as an excretory product. Animals which excrete amino acids are termed as ammonotelic animals. Some examples for ammonotelic animals include molluscs and echinoderms.

So the correct answer for this question is option (A) ureotelism.

Note: Nitrogenous waste in the body has the tendency to form ammonia which should be excreted. Mammals such as humans excrete urea at the same time birds and reptiles produce uric acid.