Question

Excretory material are formed in

• A. Kidney
• B. Rectum
• C. Liver
• D. Every cell of the body

Answer 1

The correct option is D Every cell of the body

Animals accumulate ammonia, urea, uric acid, carbon dioxide, water and ions like $N{a}^{+}$, $K^{+}$, Cl, phosphate, sulphate, etc., either by metabolic activities or by other means like excess ingestion. As metabolism is a characteristic feature of living cells. All the cells produce metabolic wastes. These substances have to be removed totally or partially. This process of removal of wastes from body is called excretion.