1 / 27

ENVIRONMENTAL ISSUES

ENVIRONMENTAL ISSUES. PEPARED BY MRS. S RATH K V III BBSR www.cbse123.co.cc. POLLUTION. Any undesirable change in physical, chemical or biological characteristics of air, land, water or soil. 3 types of pollution- air, water and soil. POLLUTANT.

may
Download Presentation

ENVIRONMENTAL ISSUES

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ENVIRONMENTAL ISSUES PEPARED BY MRS. S RATH K V III BBSR www.cbse123.co.cc CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  2. POLLUTION • Any undesirable change in physical, chemical or biological characteristics of air, land, water or soil. • 3 types of pollution- air, water and soil. CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  3. POLLUTANT • Pollutant- agents that bring about such an undesirable change in air, water and soil. • Types of pollutant- (i) biodegradable (ii) nonbiodegradable. CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  4. CAUSES OF AIR POLLUTION • Smokestacks of thermal power plants, smelters and other industries. • Burning of fossil fuels. • Smoke from forest fires, volcanic eruption. • Decomposition of garbage. CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  5. CONTROL METHODS OF AIR POLLUTION • Electrostatic precipitator • Scrubber • Catalytic converters • Control of vehicular air pollution • Auto fuel policy CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  6. ELECTROSTATIC PRECIPITATOR CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  7. ELECTROSTATIC PRECIPITATOR CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  8. SCRUBBER CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  9. WATER POLLUTION CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  10. DOMESTIC SEWAGE CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  11. AGRICULTURAL RUN OFF CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  12. INDUSTRIAL WASTES CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  13. EFFECTS OF WATER POLLUTION ON LIVING ORGANISMS • Due to dome to domestic sewage • Due to industrial chemical wastes • Due to thermal waste water CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  14. EFFECTS DUE TO DOMESTIC SEWAGE • Consumption of dissolved oxygen due to decomposition of sewage cause the death of aquatic organisms. • Nitrogen and phosphorous cause excessive growth of algae and aquatic plants which in turn • Causes (i) deterioration in water quality, (ii) fish mortality, (iii) cause diseases like typhoid, jaundice and dysentery due to the presence of pathogens. CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  15. EFFECTS DUE TO INDUSTRIAL CHEMICAL WASTE • Mercury and DDT cause biological magnification • High concentration of DDT disturb the calcium metabolism, causes thinning of egg shell and their premature breaking leading to decline of bird population. • Toxic chemicals harmful to man and other animals. CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  16. BIOMAGNIFICATIONS CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  17. BIOMAGNIFICATIONS CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  18. BIOMAGNIFICATIONS OF PESTICIDE (DDT) CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  19. EFFECTS DUE TO THERMAL WASTE WATER(HOT WATER) • Reduces or eliminates many organisms sensitive to high temperature. • Enhance the growth of plants and fish in cold areas. CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  20. SOLID WASTES • Municipal solid waste • Fly ash • Defunct ships • Hospital wastes • Industrial wastes • Electronic wastes (e wastes) CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  21. DISPOSAL OF SOLID WASTES • Burnt to reduce volume • Buried as landfills • Incinerated • Recycled CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  22. CONTRIBUTION OF GREENHOUSE GASES TO GLOBAL WARMING CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  23. MEASURE TO CONTROL GLOBAL WARMING • Reduction of use of fossil fuel • Improving energy efficiency • Reducing deforestation • Planting more trees • Reduction of the use of nitrogenous fertilizer. CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  24. EFFECTS OF OZONE DEPLETION • Damages DNA due to mutation • Ageing of skin • Damages skin and cause skin cancer • Inflammation of cornea and cataract • Lethal to microbes CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  25. CAUSES FOR DEFORESTATION • Converted into agricultural land • Cleared for making homes and establishing industries • For timber and firewood • Jhum cultivation CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  26. EFFECT OF DEFORESTATION • Increase of carbon dioxide concentration • Loss of biodiversity due to habitat destruction • Disturb hydrological cycle • Soil erosion which leads to desertification. CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

  27. PPRESENTATION BROUGHT TO YOU BY: WWW.CBSE.CO.CC "Imagination is everything. It is the previewof life's coming attractions." - Albert Einstein CLASS XII BIOLOGY: ENVIORONMENTAL ISSUES

More Related