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The following substances are the exretor...

The following substances are the exretory products in animals. Choose the least toxic from among them

A

Urea

B

Uric acid

C

Ammonia

D

Carbon dioxide

Text Solution

Verified by Experts

The correct Answer is:
B
Uric acid is the least toxidtion. Insects, and tortoises, lizards and birds change most of their nitrogenous waste into uric acid. It is the least toxic because it is insoluble in water as there are in solid form, thus contains the least water. In birds, uric acid mixes with undigested food to form the bird dropping.
Urea moves to blood get filtered and eliminated with water in urine via kidneys.
Ammonia is very toxic and needs water for diffusion.
Carbon dioxide excretion takes place through the lungs.
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