Yadav, LalitYadav, Sumitra2018-07-182018-07-181999http://krishikosh.egranth.ac.in/handle/1/5810060868In our planetary system, earth is a unique planet that provides necessary life support systems such as sunlight, air. soil, water etc. to enable life to evolve and diversify The primitive man being persistent forager and relentless hunter and over exploited the natural resources and covered a path from civilization to various stages of development So. renewable natural resources have been used by human beings since dawn of civilization Since in earlier limes there was thin population and limited use of science and technology so earth's environment was not affected appreciably as compared to contemporary world.enHome Science Extension EducationThesis