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Synopsis Eco-system made up of physical, chemical and biological processes with in a space-time of any magnitude. It is made up of three basic components--biotic (biome); abiotic (habitat) and energy components. The ecosystem is a unit of organisms connected to one another and to their environment within given space and time unit. It is powered by energy of different sorts but the solar energy is the most significant (radiation) and trends to be relatively stable equilibrium. It has the natural resource system. Human beings live upon as a giant eco-system where abiotic and biotic components are constantly acting and reacting upon each other and bringing forth structural and functional changes in it. As biosphere is difficult to handle it has been divided into its artificial subdivisions units of smaller eco-systems like of different sizes. An ecosystem can be as small as a pond, a cropland, or large as an ocean, desert or forest.