AQA A2 Biology Unit 4 - Nitrogen Cycle

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  • Created by: Charlotte
  • Created on: 10-01-13 14:25

1. What is the process where nitrogen gas is converted to nitrogen containing compounds called?

  • Nitrification
  • Nitrogen fixation
  • Denitrification
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2. What must be done by farmers to prevent the build up of denitrifying bacteria?

  • Nothing
  • Keep the soil aerated
  • Keep the soil waterlogged

3. Where do mutualistic nitrogen fixing bacteria come from?

  • Root hairs
  • Nodules on the roots of plants
  • Leaves

4. What type of microorganism increases if the soil becomes waterlogged?

  • Anaerobic denitrifying bacteria
  • Aerobic denitrifying bacteria

5. What is the second stage of nitrification carried out by nitrifying bacteria?

  • Reduction of nitrate ions to nitrate ions
  • Oxidation of nitrate ions to nitrate ions
  • Oxidation of ammonium ions to nitrate ions
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