Which of the following is the most toxic nitrogenous waste?

Carbon dioxide

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Urea

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Uric acid

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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.

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Similar questions

The following substances are the excretory products in animals. Choose the least toxic form among them.
(a) Urea (b) Uric acid
(c) Ammonia (d) Carbon dioxide

Q. Arrange the following in correct order based on increasing toxicity.

(a) Urea
(b) Uric acid
(c) Ammonia

Compared to ammonia and urea, uric acid is least toxic and least soluble in water.

Q. In comparison to ammonia and urea, uric acid is the least toxic and the least soluble in water.

Q. Assertion :Nitrogenous matter produces ammonia. Reason: Mammals excrete urea and birds,reptiles produce uric acid which is a metabolite of amino acids

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