Q.1 Explain excretion in plants ???

O Khushi ya googel sa bhej diya boh bhi humans ka... ??

Sorry I have sent excretion in humans ?

The process of the removal of the harmful metabolic wastes from the body is called excretion. Excretory system of human beings includes : A pair of kidneyA Urinary BladderA pair of UreterA UretheraProcess of Excretion Renal artery bring in blood containing waste substances to the kidneys. Kidney filters blood. Urine produced in the kidneys passes through the ureters into the urinary bladder where it is stored until it is released through the urethera.Function of Kidney : It is remove waste product from the blood i.e., urea which is produced in the liver.Nephron : Each kidney has a large number of filtration units called nephrons. Nephron is the structural and functional unit of Kidney. Mechanism of Urine Formation : The Urine formation involves three steps:Glomerular Filtration : Blood is filtered from the glomerulus into Bowman Capsule of the nephron. This filtrate passes through the tubules of the nephron.Tubular re-absorption : Now, useful substances from the filtrate Like  , glucose, amino acids etc. are reabsorbed by the capillaries surrounding the nephron into the blood.Secretion : Urea, extra water and salts are secreted into the tubule which open up into the collecting duct & then into the ureter.Haemodialysis: The process of purifying blood by an artificial kidney. It is meant for Kidney failure patient.