Question
Distinguish between Ureotelism and Uricotelism.

Answer

No.UreotelismUricotelism
i.It is the elimination of nitrogenous waste in the form of urea.It is the elimination of nitrogenous waste in the form of uric acid.
ii.Excretion of urea requires less (moderate ) amount of water.Excretion of uric acid requires negligible amount of water.
iii.Removal of 1 gm of urea requires 50 ml of water.Removal of 1 gm of uric acid requires 5 – 10 ml of water, j
iv.Urea is less toxic.Uric acid is least toxic.
e.g.It is generally seen in terrestrial animals. Mammals, cartilaginous fishes (sharks and rays), many aquatic reptiles, most adult amphibians, etc.It is seen in birds, some insects, many reptiles, land snails, etc.

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