Environment means our surroundings, which comprises of land, water and air and other bodies. Environment is affected by the physical properties of these components. It is also affected by the changes in interrelationship prevailing between and among the components ranging from micro-organism to human bodies. Our life-support system is maintained by all the species that make up the biosphere-biodiversity. The survival of all these species is interconnected and dependent on each other. Human being is also a part of this biosphere; extinction of one species may trigger the extinction of many more species and may decline our life-support system for us and for future generations.