Plant wastes are carbon dioxide and water released during respiration, and oxygen is released as waste during photosynthesis. Some of these are also removed through the stomata which are present on the surface of the leaves. The other wastes of plants are latex, resin, and tannins.

The excretory system consists of organs for the removal of metabolic waste and toxins for the body of organisms. Its consists of kidney, ureter, urinary bladder, and urethra. The ureter is a long tube that carries the urine from a kidney towards the urinary bladder.

The process of removing harmful metabolic wastes such as urea, uric acid and salts from the body is called the excretion. Blood contains both useful and harmful substances. We have kidneys which separate useful substances by reabsorption and toxic substances by producing urine.

The excretory system consists of organs for the removal of metabolic waste and toxins for the body of organisms. A nephron is the structural and functional unit of the kidney. Its function is blood filtration and removal of unwanted waste materials from the body and also to maintain the pH of blood.