question_answer 13)

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

Answer:

                (b) Uric acid is the least toxic ions. Insects, land 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-