Page 34 of the GCP A2-Level Biology Revision Guide.

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  • Eutrophication
    • Nitrates leached from fertilised fields stimulate the growth of algae in ponds and rivers
      • Leaching is when water soluble compounds in soil are washed away (by rain etc) and are washed into rivers or nearby water courses.
      • Large amounts of algae block light from reaching the photosynthetic plants below.
        • Eventually the plants die as they are unableto photoynthesise.
          • Bacteria feed on the dead plant matter
            • The increased number of bacteria reduce the oxygen concentration in the  water by aerobic respiration
              • Fish and other aquatic organisms die because there isn't enough dissolved oxygen.


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