Question

Which of the following is correctly categorised?
A. Ammonotelic: Pigeon, Humans
     Ureotelic: Aquatic amphibia, Lizards
     Uricotelic: Cockroach, Frog
B. Ammonotelic: Aquatic amphibia
     Ureotelic: Frog, Humans
     Uricotelic: Pigeon, Lizards, Cockroach
C. Ammonotelic: Aquatic amphibia
     Ureotelic: Cockroach, Humans
     Uricotelic: Frog, Pigeon, Lizards
D. Ammonotelic: Frog Lizards
     Ureotelic: Aquatic amphibia, Humans
     Uricotelic: Pigeon, Cockroach

Answer 1

Hint: The secretion of nitrogenous waste in the form of soluble ammonia is performed by ammonotelic organisms. The organisms which excrete nitrogenous waste in the form of urea are ureotelic. The organism that secretes nitrogenous waste in the form of uric acid or its salts is called uricotelic.

Complete answer:
The animals which excrete the nitrogenous waste in the form of ammonia are known as Ammonotelic organisms which include aquatic amphibia. The organism which excretes nitrogenous waste in the form of urea is known as ureotelic organisms which include the frog and humans. The organisms which excrete nitrogenous waste in the form of uric acid are known as uricotelic organisms which include pigeons, lizards and cockroaches. Ammonia is a substance that is the most water-soluble and forms a compound ammonium hydroxide with water that directly injures the cells through its alkaline caustic action. Due to this the excretion of ammonia requires a large amount of water and the oxidation of a small portion of uric acid takes place to form allantoic acid and Allantoin. Allantoate is secreted by teleost fish and is secreted as a hydration product of allantoin.
Uricotelic organisms form uric acid as their end product of nitrogen metabolism from a 3 lobed Avian kidney which is located in the area of the dorsomedial coelomic cavity in the words and situated against and within the ventral aspect of the cranial rib and on its vertebral surface. The reptiles are mostly uricotelic which includes lizards that form uric acid as the end product of their protein catabolism through their liver and transfer it to a metanephric kidney.

So, the correct answer is option B. Ammonotelic: Aquatic amphibia, Ureotelic: Frog, Humans, Uricotelic: Pigeon, Lizards, Cockroach

Note:
Crocodiles are defined as ammonia-uricotelic organisms as they produce liquid nitrogen as waste in the form of ammonia and during the times of fasting day increases the excretion of uric acid. The reptiles are uricotelic which allows them to conserve fluids uniquely from the other animal groups.