A) formation of those substances, which have some role in the body
B) removal of such substances, which have never been part of the body
C) removal of useless substances and substances present in excess
D) All of the above
Correct Answer: C
Solution :
Excretion means elimination of waste products from the body of an organism. Waste products are unwanted and toxic byproducts, which are removed to maintain homiostasis and protect the body from toxicity. The major metabolic waste products are Nitrogenous waste products are formed during metabolism of excess protein, amino acids, nucleic acid, alkaloid etc, and include, ammonia, urea, uric acid, creatinine, amino acids, guanine, allantoin etc. Non-nitrogen waste product, eg, oxalic acid, lactic acid. Bile pigment Bilirubrin, biliverdin etc. \[C{{O}_{2}}\] (e) Excess water and (f) Excess chemicals.
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