Nutrition is the combination of processes by which living organisms recieve and utilize the material necessary for the maintenance of its functions and for the growth and renewal of its components.Nutrition comes from the latin word Nutr - which means nurture or nourish.
they have two modes of nutrition:
1) Autotrophic : These are green plants that prepare their own food by the process photosynthesis. It is an autotrophic mode of nutrition. The process by which the green plants prepare their food in the presence of sunlight, water and chlorophyll is called photosynthesis.
2) Heterotrophic : These plants cannot prepare their own food.And they can be saphrophytic, symbiotic and parasitic.
hope it helps.. :-)