Elimination of toxic and waste products from the body is called excretion. Organisms like animals have an advanced and specialized system for excretion. But plants lack a well developed excretory system like that in animals. They do not have special organs for excretion. Excretion of plants can be summarized as follows:-
Transpiration:- gaseous wastes and water are excreted through stomata, lenticels of the stem.
Storing:- Some organic wastes are stored in plant parts like barks and leaves.
Diffusion:- Aquatic plants excrete metabolic wastes through diffusion. Terrestrial plant excrete into the soil.