A) \[N{{H}_{3}}\]
B) Urea
C) Uric acid
D) All of these
Correct Answer: B
Solution :
Urea is both nitrogenous product as well as osmoregulator. It is excretory product in man and mammals, Ascaris, earthworm, fishes like sharks and sting rays etc. Sharks retain large quantity of urea in their blood, therefore, blood osmotic pressure approaches that of sea water, which minimises water loss from their body. Ammonia is excretory product in most aquatic arthropods, most aquatic molluscs, bony fishes, amphibian tadpole, etc. Uric acid is excretory product of mostly insects, some land crustaceans, land snails, etc.
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