The nitrogen cycle and the phosphorus cycle Quiz
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5 questions, one answer each
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1. Which bacteria oxidise ammonium ions to nitrite and then nitrate?
- A. Denitrifying bacteria
- B. Nitrifying bacteria
- C. Nitrogen-fixing bacteria
- D. Saprobionts
2. Which process happens in anaerobic, waterlogged soil?
- A. Nitrification
- B. Nitrogen fixation
- C. Ammonification
- D. Denitrification
3. What is the role of mycorrhizae?
- A. To fix nitrogen in root nodules
- B. To increase uptake of water and ions by plants
- C. To decompose dead leaves
- D. To convert nitrate to nitrogen gas
4. Where is the main store of phosphorus in the phosphorus cycle?
- A. The atmosphere
- B. Plant roots
- C. Rock
- D. Dead leaves
5. Which term describes the conversion of organic nitrogen compounds in dead material to ammonium ions?
- A. Ammonification
- B. Nitrification
- C. Denitrification
- D. Nitrogen fixation