OCR - F215 - The Nitrogen Cycle

(l) describe how microorganisms recycle nitrogen within ecosystems. (Only Nitrosomonas, Nitrobacter and Rhizobium need to be identified by name).

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1. Nitrogen is fixed in the ground by which bacteria?

  • Nitrogenase
  • Rhizobium
  • Nitrobacter
  • Nitrosomonas
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Other questions in this quiz

2. The process by which nitrate in the soil return to nitrogen gas in the air is called denitrification

  • True
  • False

3. In which way can nitrogen gas be converted directly into nitrate ions in the soil

  • Excretion
  • The Haber Process
  • The death of leguminous and non-leguminous plants
  • Lightning
  • Nitrogen fixation

4. Which stage of the nitrogen cycle does the bacteria Nitrosomonas oxidise

  • Ammonium in the soil to nitrites in the soil
  • Nitrites in soil to nitrates in soil
  • Nitrates in the soil to nitrogen gas in air
  • Nitrogen gas in the air to organic nitrogen in the soil
  • Organic nitrogen in the soil to ammonium in the soil

5. The bacteria which oxidises nitrites in the soil to nitrates in the soil is called Nitrosomonas

  • False
  • True
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Emma Thomas

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rubbish questions, all too similar

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