Continuous interaction between components and sub-components involves the flow of energy . The food chain is the transfer of energy sequentially that takes place from one trophic level to another trophic level. In a food chain, the members at the successively higher levels become smaller in number . When the numbers at successive levels are plotted , they assume the shape of a pyramid; hence it is called a food pyramid. Food chains are not always so simple and isolated sequences. Several inter-connected and overlapping food chains present a complicated pattern called a food web. The ecological pyramid is the way of representation different organisms having different trophic levels and transfer of energy from one tropic level to another. The energy flow along with the pyramid always remains unilateral and approx 10% is transferred from each tropic level. The ecological pyramid deals with the relationship between the number of primary producers and consumers of different orders. A large terrestrial or aquatic ecosystem characterized by specific plant communities and formations is called Biome . Biome includes all plants, animals, and soils where all the biota has minimum common characteristics.