Q.

Uric acid is the chief nitrogenous wastes in –

A. Frogs
B. Birds
C. Fishes
D. Mankind
Answer» B. Birds
Explanation: Land snails, insects, birds, and some reptiles excrete uric acid as the major nitrogenous waste. The white, crystalline substance seen in a typical bird or lizard "poop" is actually urine: a little pool of uric acid crystals in a very small amount of water.
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