Question

Describe the various methods of excretion in animals.

Answer 1

Excretion is outlined as the removal of those substances from the body which are not of any additional help to the organism or just waste for the organism. In addition, the different ways to excrete depend on the substances which are excreted.

Complete answer:
There are 5 modes of excretion that are illustrious in animals. They are:
1. Aminotelism (In this amino acid is excreted) - Certain mollusks and echinoderms eliminate excess amino acids. This feature is termed aminotelism.
2. Ammonotelism (In this ammonia is excreted) - The process of eliminating ammonia from the body is understood as Ammonotelism, and also the organisms that exhibit this nature are known as ammonotelic. Most fishes, protozoans, echinoderms, poriferans, and crustaceans comprise this class. Aquatic animals egest ammonia directly into the environment; wherever the compound is quickly diluted. It's additionally terribly toxic to tissues
3. Ureotelism (In this urea is excreted) - In some mammals and amphibians, urea is excreted because of the metabolic waste merchandise. Such organisms are known as ureotelic. Humans are ureotelic as we tend to expel the urea through excreta. Moreover, carbamide is relatively less deadly than ammonia.
4. Uricotelism (Uric acid is excreted) - Uricotelic animals take away gas wastes as acid within pellets or paste. Metabolically, this method is sort of costly; but, the water loss is the smallest, and there is the smallest amount virulent. Moreover, since acid isn't prone to be soluble in water, the excrements are kind of pasty white suspensions. Many reptiles, birds, and also insects are classified as uricotelism.
5. Guanotelism (guanine is excreted) - Spiders convert the ammonia into Guanine before excretion. This characteristic is additionally found in some reptiles, birds, and earthworms. It’s conjointly insoluble in water; therefore no water is needed for its excretion.

Note: All vertebrates have kidneys – body waste is urea and excretory organs are flame cells in Platyhelminthes. Earthworms have Nephridia whereas Cockroaches have malpighian tubules and Prawns have antennary glands for excretion.