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Excretory Products And Their Elimination

Question

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Distinguish between
(a) Ammonotelism, ureotelism and uricotelism

Solution

Ammonotelism	Ureotelism	Uricotelism
Ammonotelism occurs in aquatic animals.	Ureotelism occurs in terrestrial amphibians and some aquatic animals.	Uricotelism occurs only in terrestrial animals.
Ammonia is excreted	Urea is the major excretory product	Uric acid is the excretory product.
Ammonia is very toxic	Less toxic	Least toxic.
A lot of water is required for elimination of Ammonia.	Comparatively less water is required for elimination of urea.	Little water is required for elimination of uric acid.

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Give the term for the following
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iii. Conical masses projecting into the calyces.
iv. Renal columns between the medullary pyramids

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