Excretion

the method of expulsion of metabolic wastes excreted from the body.

1. Filtration and excretion from the blood of toxic wastes produced by the metabolic reactions of cells. 2. The maintenance of homeostasis by the balance of water and the ionic content of the blood and tissue fluid. 3. The maintenance of the normal functions of the cells and the regulation of blood content.

 Unicellular and fresh water organisms like paramecium and amoeba provide excretion by aid of contractile vacuoles.

discharge excess amount of water from cytoplasm.

There is no specialized system of excretion in plants. However, there are some organs are concerned with excretory processes, they are: stomata, lenticels, hydathodes, vacuoles, and roots. Some plants excrete organic and inorganic salt into the soil by their Plants living in calcium rich soils store nitrogenous wastes in their vacuoles in form of calcium Oxalate crystals and expelled when the leaves are shed. Plants also convert nitrogenous wastes into color pigments in their petal.

Carbon dioxide and water is excreted through lenticels and stomata.

water and salt is released from plants living in marshy environments through hydathodes in form of drops.