Which one is the most poisonous excretory substance?
A
Uric acid
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B
Urea
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C
Ammonia
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D
Hippuric acid
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Solution
The correct option is B Ammonia Ammonia is highly toxic. It must be removed immediately from the body. Excretion of ammonia takes place with the help of water. Kidneys do not play any significant role in the elimination of ammonia.