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NCERT CLASS 12 BIOLOGY CHAPTER 16 ENVIRONMENT ISSUES

Electrostatic precipitator-CONCEPTREE-LEARNING
Electrostatic precipitator
Composition of waste water-CONCEPTREE-LEARNING
Composition of waste water
Effect of sewage discharge on some important characteristics of a river-CONCEPTREE-LEARNING
Effect of sewage discharge on some important characteristics of a river
Pictorial view of an algal bloom-CONCEPTREE-LEARNING
Pictorial view of an algal bloom
Biomagnification of DDT in an aquatic food chain-CONCEPTREE-LEARNING
Biomagnification of DDT in an aquatic food chain
Sunlight energy at the outermost atmosphere-CONCEPTREE-LEARNING
Sunlight energy at the outermost atmosphere
Relative contribution of various greenhouse gases to total global warming-CONCEPTREE-LEARNING
Relative contribution of various greenhouse gases to total global warming
Ozone hole-CONCEPTREE-LEARNING
Ozone hole