Question

true or false ammonia is a major and urea and uric acid are minor form of nitrogenous waste excreted by animals
and why explain

Answer 1

Execretion means the separation and elimination of Waste material from the body.

* Organisms are three type on the bases of excretory substances :

(i) Ammonotelic

(ii) Ureotelic

(iii) Urecotelic

* In human excretory organ is a pair of kidney, one urinary blandder and urethra.

* Kidney are reddish brown color, bean shaped and on either side of the vertebral column in the lumber region. Each kidney is about 10cm long, 5 cm wide and 3 cm thick. In adult, it weight about 125-170 gm

* Each human kidney is containing about a million nephrons. Nephrons are refered to as the structural and the function units of the kidney. It known as uriniferous tubules.

* Each nephrons is about 3 cm long and 20-30 cm in diameter. Nephron consists of Bowman’s capsule, proximal convoluted, henle’s loops, distal convoluted and colleting duct.

* They comprise structure of glomerules and Brown’s capsule is called malpighian corpuscles, where filtration of blood and urine formation is started.

* Urine formation involves three phase :

(i) Glomerular filtration

(ii) Re-absorption and

(iii) Tubular secreation.