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NEET UG 2026 » NEET UG Study Material » Biology » Uricotelics
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Uricotelics

Uricotelic animals are those that excrete nitrogenous wastes, such as uric acid, in the form of pellets or paste with the least amount of water loss. These include reptiles (such as lizards), birds (such as crows), land snails, and insects.

Table of Content
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Animals with ammonotelic properties

As soluble ammonia, an ammonotelic organism excretes nitrogenous waste from its body. The ammonia produced as a byproduct or waste is extremely toxic. Because it is highly soluble, it requires a large amount of water for excretion.

Example- The majority of aquatic animals, including protozoans, crustaceans, platyhelminthes, cnidarians, poriferans, echinoderms, fishes, and amphibian larvae and tadpoles, are ammonotelic.

Animals that are ureotelic Ammonotelic

Ammonotelic excretion is the term used to describe the process of excreting nitrogenous waste in the form of ammonia. Ammonotelism is the term used to describe the phenomenon. In their excreta, urea acid is excreted by a variety of animals, including birds, amphibians, reptiles, most aquatic animals (including fish), some terrestrial invertebrates (such as larvae), and mammals (such as humans).

Animals that are ureotelic

A ureotelic organism is one that excretes excess nitrogen in the form of urea. In comparison to ammonia, urea is less toxic and requires less water to produce. It is excreted by the uricotelic organism, which is uric acid or its salts. Uric acid, in contrast to ammonia and urea, is the least toxic and the least soluble in water of the three compounds. It has the ability to be stored in cells and body tissues without causing toxic effects, and as a result, it requires the least amount of water and is the most efficient mode of excretion when compared to the other two.

Example- Cartilaginous fish, a few bony fishes, adult amphibians, and mammals (including humans) are all examples of ureotelic organisms.

Animals that are uricotelic

Uricotelic organisms are organisms that excrete uric acid waste and are found in a variety of environments. In most cases, the excreta of uricotelic organisms is a white paste that contains insoluble solids or semi-solids. It only takes a small amount of water to flush out the uric acid.

Example- Arthropods (including insects) and birds are among the species of uricotelic organisms that exist on the terrestrial plane. 

Conclusion

As soluble ammonia, an ammonotelic organism excretes nitrogenous waste from its body. Fishes and amphibian larvae and tadpoles are among the ammonotelic animals, which include protozoans, crustaceans, platyhelminthes, cnidarians, poriferans, echinoderms, and other aquatic animals. A ureotelic organism is one that excretes excess nitrogen in the form of urea. In comparison to ammonia, urea is less toxic and requires less water to produce. Cartilaginous fish, a few bony fishes, adult amphibians, and mammals (including humans) are all examples of ureotelic organisms. It is excreted by the uricotelic organism, which is uric acid or its salts. Uric acid is the least toxic and least soluble in water of the three compounds studied: ammonia, urea, and urea. It has the ability to be stored in cells and body tissues without causing toxic effects, and as a result, it requires the least amount of water and is the most efficient mode of excretion when compared to the other two methods. Arthropods (including insects) and birds are among the species of uricotelic organisms that exist on the terrestrial plane. In most cases, the excreta of uricotelic organisms is a thick white paste.

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Get answers to the most common queries related to the NEET UG Examination Preparation.

Which diseases can be eliminated by animals? Which diseases can be eliminated by animals?

Ans. Urea, ammonium nitrate, and uric acid are the three most common nitrogenous waste products excreted by animals....Read full

What causes birds to excrete uric acid rather than urea?

Ans. In comparison to the conversion of ammonia into urea, the conversion of a...Read full

What exactly are uricotelic animals, and can you give an example?

Ans. Uricotelic animals – These are animals that have a uricotelic skeleton. Uricotelic organisms are animals that...Read full

Which of the animals is armed with a firearm?

Ans. Animals with ammonotelic properties ...Read full

What kind of environment is best suited for an ammonotelic animal?

Ans. Ammonotelic organisms include organisms that live in or near water bodies, such as bony fishes, aquatic amphibi...Read full

What is it about terrestrial animals that makes them non-ammonotelic?

Ans. Terrestrial animals are typically either ureotelic or uricotelic, rather than ammonotelic, as a result of the n...Read full

Ans. Urea, ammonium nitrate, and uric acid are the three most common nitrogenous waste products excreted by animals. Ammonia is the most toxic form of nitrogen and requires a large amount of water to be removed, whereas uric acid, which is the least toxic form, can be removed with the least amount of water loss possible.

Ans. In comparison to the conversion of ammonia into urea, the conversion of ammonia into uric acid is more energy-intensive. Producing uric acid instead of urea has several advantages, including the fact that it is less toxic and reduces water loss, as well as the need for additional water.

Ans. Uricotelic animals – These are animals that have a uricotelic skeleton. Uricotelic organisms are animals that excrete uric acid in the form of waste and are classified as such. In comparison to ammonia and urea, uric acid is the least poisonous and the least soluble in water of the three. Uricotelic animals include birds, snakes, and lizards, to name a few.

Ans. Animals with ammonotelic properties

The majority of aquatic animals, including protozoans, crustaceans, platyhelminthes, cnidarians, poriferans, echinoderms, fishes, and amphibian larvae and tadpoles, are ammonotelic.

Ans. Ammonotelic organisms include organisms that live in or near water bodies, such as bony fishes, aquatic amphibians, and aquatic insects, because ammonia requires a large amount of water to be produced and maintained.

Ans. Terrestrial animals are typically either ureotelic or uricotelic, rather than ammonotelic, as a result of the need to conserve water that terrestrial animals face. Because ammonia is toxic in nature and is water soluble, it is not completely eliminated from the body when consumed.

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