A blog covering and explaining the Edexcel IGCSE Biology specification for the 2016 summer exams. If you are doing just double science, you do not need to learn the stuff for paper two, if you are doing triple you will need to learn all (GOOD LUCK!) I have separated the papers to make files easier to find. Hope it helps :)
4.15 understand the biological consequences of pollution of water by sewage, including increases in the number of micro-organisms causing depletion of oxygen
Like fertilisers, sewage also contains phosphates (from detergents) and nitrates (from faeces etc). If these are leaked into rivers, eutrophication occurs. NOTE: Point 4.16 my help for understanding
No comments:
Post a Comment