Home Biology Excretory Products and Their Elimination NCERT Examplar The following substances are the excretory p…
Biology Excretory Products and Their Elimination NCERT Examplar Single Correct MCQ
Published on: August 21, 2026

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

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The correct answer is:

                    

Insects, land snails, lizards and birds change most of their nitrogenous waste into uric acid. It is least toxic and is insoluble in water. It therefore can be excreted as a semisolid paste with very little water loss. Urea moves to blood get filtered and eliminated with water as urine via kidneys.
Ammonia is very toxic and needs water for diffusion.
Carbon dioxide excretion takes place through the lungs.

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