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  1. l URL: https://www.alokpdf.com/basics-of-ecology

  2. Unit-2 Air Pollution URL: https://www.alokpdf.com/air-pollution

  3. Unit-3 Water and Soil Pollution: URL: https://www.alokpdf.com/water-and-soil-pollution

  4. Unit 4 Impact of energy Usage URL: https://www.alokpdf.com/impact-of-energy-usage-on-environment

  5. Unit 5 Disaster Management URL: https://www.alokpdf.com/disaster-management