eutrophication

• what do fertilisers contain


  nitrate potassium and phosphate
• the crops need fertilisers containing nitrates


  for the production of nucleic acids and amino acids
• why do crops need fertilizers containing potassium


  for stomatal openings
• why do crops need fertilizers containing phosphates

  for the production of nucleic acids and ATP
• what is meant by eutrophication


  this is where the body of water becomes overly enriched with minerals and nutrients and induce excessive growth of plants and algae
• what could be a bad side effect of eutrophication in the body of water


  this may result in oxygen depletion in the body of water
• what is the first step of eutrophication


  fertilisers leach into water courses increasing levels of nutrients
• what happens after there is an increase of nutrients in the body of water in eutrophication


  there is a bloom of algae blocking out the light plants low these plants die as they cannot photosynthesise
• what happens in eutrophication after algae is formed on the body of water and the plants below are unable to photosynthesise


  decomposers such as bacteria and fungi decompose the dead organic matter
• during eutrophication what happens when a decomposers break down the dead organic matter


  As the bacteria respire aerobically they use up most of the oxygen available creating a biological oxygen demand
• what is meant by a BOD


  biological oxygen demand
• what happens during unification as decomposers create a biological oxygen demand


  the aquatic animals die due to lack of oxygen causing the anaerobic bacteria to flourish
• in what way is nitrogen levels be managed in waterways


  by restricting the amount of fertilisers added to soil and by digging drainage ditches for minerals to concentrate in