Describe various strategies by which the food is taken in and used by the organism

Explanation

Various strategies are followed by organisms to obtain and digest the food because the food and the way to obtain it differ. The digestive system is different in various organisms. In single cell organism, the food may be taken in by the entire surface. But as the complexity of the organism increases, different parts become specialised to perform different functions. For example, Amoeba takes its food using temporary finger-like extensions of the cell surface and diffuses it into the cytoplasm where as human beings eat ripe and cooked food and gets it digested in his stomach.