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...Assam university silchar environmental studies aecc one semester compulsory core module for undergraduate programmes unit introduction to and ecosystems lectures definition scope importance of multidisciplinary nature need public awareness concept ecosystem producers consumers decomposers energy flow in an food chains webs ecological pyramids succession nutrient cycles carbon cycle nitrogen major forest grassland desert aquatic pond lake river ocean natural resources renewable non land change degradation soil erosion desertification effects deforestation due timber logging shifting cultivation mining dams on forests tribal populations water use over exploitation surface ground floods droughts conflicts inter state international alternative biodiversity conservation levels genetic species diversity biogeographic zones india patterns global hot spots as a mega nation endangered endemic with special reference north east threats habitats loss poaching wildlife man indian context biological...