Food production

• Why does the yield of food produced need to increase

  Human population
• What can farmers use to increase yield

  Fertiliser
• What can be added to soil to increase the nitrate content

  Fertiliser
• How are nitrates absorbed into plants

  Nitrates dissolve in soil water
• Plants make amino acids using the nitrates absorbed
• Amino acids are synthesised into plant proteins
• How do animals obtain amino acids for protein synthesis

  Consume plants or other animals
• What is the gas bacteria used up in eutrophication

  Oxygen
• Pesticides are plants and animals which reduce crop yield and can be killed by pesticides
• What is bioaccumulation

  The build-up of toxic substances in living organisms
• What is pollution

  Anything added to an ecosystem that causes harm
• What can be used to reduce the use of fertilisers and pesticides

  Genetically Modified Plants
• Biological control can be used as an alternative to the use of pesticides