A) \[C{{O}_{2}}\]
B) Urea
C) Ammonia
D) Ammo acids
Correct Answer: C
Solution :
Ammonia is the most toxic excretory product. The excretory material of bony fish is ammonia e., ammonotelic. Ammonia is highly soluble in water with which it forms NI40H. The latter passes readily across the cell membranes and is dispersed into the surrounding water. Excretion of urea is known as ureotelism and the animals which excrete urea are called ureotelic. Ureotelic animals include Ascaris, earthworm, cartilaginous fishes. Certain invertebrates like some molluscs (Unio, Limnaea etc.) and some echinoderms (e.g., Asterias) excrete excess amino acids as such. These animals are called aminotelic and their mode of excretion is called aminotelism.
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