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6. What process happens when soil becomes waterlogged?

  • Denitrification - anaerobic denitrifying bacteria convert gaseous nitrogen into soil nitrates
  • Denitrification - anaerobic denitrifying bacteria convert soil nitrates into gaseous nitrogen
  • Denitrification - aerobic denitrifying bacteria convert soil nitrates into gaseous nitrogen
  • Ammonification - nitrogen-containing compounds are broken down by saprobionts to produce ammonium ions

7. Eutrophication is when nitrogen concentrations increase causing algae to grow at the surface of the water, blocking light to photosynthesising plants below which saprobionts then feed on and respire aerobically, using up oxygen

  • True
  • False

8. What do nitrifying bacteria do to ammonium ions?

  • Oxidation of ammonium ions to nitrate ions, then oxidation of nitrate ions to nitrite ions
  • Oxidation of ammonium ions to nitrite ions, then oxidation of nitrite ions to nitrate ions
  • Convert ammonium ions into nitrogen gas