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Question

Which of the following is the most toxic nitrogenous waste?



A

Carbon dioxide

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B

Urea

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C

Uric acid

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D

Ammonia

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Solution

The correct option is D

Ammonia


Ammonia is the most toxic nitrogenous waste and requires a lot of water to be flushed out of the body. Most of the aquatic animals including protozoans, crustaceans, platyhelminthes, cnidarians, poriferans, echinoderms, fishes, larvae/tadpoles of amphibians are ammonotelic i.e. they excrete nitrogenous waste in the form of ammonia. 


Biology

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