1.1 Background of the Study
Environment is a comprehensive term, which comprises of all the factors which make up the surroundings. The air that one breathes, the land on which one lives, the water one drinks and all the living and non-living things that are part of the surroundings are referred to as the environment1. Environments are components of ecosystems. An ecosystem is a community of micro-organisms and their physical and chemical environment that functions as an ecological unit. The ecosphere or biosphere, organise the entirety of living organisms on Earth and the abiotic surroundings they occupy. It can be divided into atmosphere, hydrosphere and litho-ecosphere to define the shares of the global expense inhabited by living things in air, water and soil environments respectively. The environment has rendered a significant contribution in the evolution of the biological spectrum by the process of natural selection and elimination. The environment has influenced and structured the lives of the individuals since ancient past.