Nutrients: substances that provide energy and help building body constituents. Nutrition: The intake and utilisation of nutrients is known as nutrition. Saprophytic nutrition: 1) in this mode of nutrition organism derive their nutrients from dead and decaying organic matter . 2) such organisms break-down the food material outsude their body and then absorb the digested food material eg: Fungi like bread moulds,yeasts and mushrooms . Holozoic nutrition : 1) in this mode of nutrition, an organism takes complex organic food material into its body by the process of ingestion. 2) the ingested food is then digested and absorbed into the body cells of the organism for assimilation and energy production. Example: amoeba ,human beings etc