BiologyExchange.co.uk Shared Resource

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BiologyExchange.co.uk Shared Resource

  1. 1. <ul><li>Aims of the session: </li></ul><ul><li>Learn about fertilisers and their effects on the environment. </li></ul><ul><li>Be able to answer exam questions on the effects. </li></ul><ul><li>Learn about Pesticides and their effects </li></ul><ul><li>Summarise the key points about pesticides </li></ul>
  2. 2. Fertilisers and Pesticides
  3. 3. Fertilisers                              
  4. 8. The process of Eutrophication fertilisers sewage (liquid domestic and industrial waste) minerals esp. nitrates minerals esp. phosphates eutrophication algal bloom competition for light consumers can't consume fast enough dead plants dead algae
  5. 10. The process of Eutrophication cont. dead plants dead algae detritus more decomposers use up oxygen by aerobic respiration (increased BOD) aerobes die (invertebrates, fish, etc) anaerobic bacteria thrive. Release NH4, CH4, HS2
  6. 11. Biochemical Oxygen Demand (BOD). This measures the rate of oxygen consumption by a sample of water, and therefore gives a good indication of eutrophication. A high BOD means lots of organic material and aerobic microbes, i.e. eutrophication
  7. 16. The nitrate concentration falls during spring and summer and rises during autumn and winter Less algal growth as autumn begins Possibly all plants have died
  8. 18. Pesticides
  9. 19. Pesticides <ul><li>Include: </li></ul><ul><li>Herbicides </li></ul><ul><li>Insecticides </li></ul><ul><li>Fungicides </li></ul><ul><li>Bactericides </li></ul>
  10. 22. Pesticides Persistence + Lipid solubility = Bioaccumulation
  11. 23. Bioaccumulation E.g DDT                                                                 
  12. 25.                                                              
  13. 26. http://www. abdn .ac. uk /~nhi904/ biocet /index. htm

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