Average quantity of urea excreted daily humans per day is
A. 10-15 g
B. 25-30 g
C. 40-50 g
D. 100-500 mg

Hint: Urea is an organic compound which is also called carbamide. Urea plays a significant role in the metabolism of nitrogen-containing compounds by the animals and is the major nitrogen-containing substance in the urine of mammals. It is odorless, solid, colorless, non-toxic, and highly soluble in water.

Step by step answer:Urea is formed of nitrogen in the body of animals that is excreted out of the body. The liver is responsible for the formation of urea in the body of animals by combining two molecules of ammonia molecules with carbon dioxide molecules to form urea. There is a urea cycle in our body that helps in the formation of urea in the liver and excretes the waste nitrogen compound out of our body. Urea is also used in fertilizers as a source of nitrogen compound and is an important raw material for the chemical industry. The constituents of urea in the human body are 95 percent water, 2.5 percent other waste, and 2.5 percent urea. Humans are considered to be ureotelic as urea is the major excretory waste. On an average 25-30 g of urea is excreted out of the body of humans per day.
Hence, the correct option is B. 25-30 g.

Note: As urea is formed from ammonia inside our body and when urea goes stale, the bacteria again convert it back into ammonia which gives it the pungent smell of lavatories. The disorder which impairs the elimination of urea from the kidney can lead to uremia, which can be fatal.