Question

The waste product produced in man, which need excretion are A. Carbon dioxide B. Urea and salts C. Excess of water D. All of the above

Answer 1

Hint: Excretion is the process in which the organism removes waste. It is done with the liver, lungs, kidney and skin in vertebrates.

Complete answer:
Excretion is the process of removal of waste products from the body. Human excretory system contains a pair of ureters, a pair of kidney, urinary bladder and urethra. Pair of ureters: It is the muscular tube which brings the urine to the bladder. Pair of Kidney: are bean shaped consisting of nephrons, capsule and henle’s loop. Urinary bladder: It is a sac like structure for storage of urine. Urethra: It helps in passing out urine from the body.
Excretion is the process by which toxic substances from the human body are removed. The waste products produced in humans are carbon dioxide, urea and excess water. The waste products are in the form of ammonia which is very harmful. They are different excretory organs in humans like liver, lungs, large intestine, kidney and skin. Liver removes high amount of amino acids in blood Kidney helps in regulation of urinary system. Large intestine clears solid waste from body Lungs breathe out carbon dioxide and water vapour Skin liberates salt and excess salts through sweating In humans it is very important to get rid of two types of waste: Metabolic waste(sweat and urine)whereas digestive system waste(feces). Egestion is the process of removal of intestinal waste (pooping) and reduction of metabolic waste is excretion.

Therefore the correct answer is D.

Note: The metabolic waste is excreted out by excretory organs in the form of water solutes like nephridia, kidney and malpighian tubules whereas carbon dioxide is excreted in the lungs with water vapour. The elimination of these substances helps in maintaining the organism's chemical homeostasis.