The Nitrogen Cycle Flashcards
1
Q
Which bacteria are involved in nitrogen fixation?
A
• Azotobacter - in free living
• Rhizobium - in root nodules
2
Q
What do the bacteria involved in nitrogen fixation do?
A
Combine N2 with H2 to form NH3 (ammonia)
3
Q
What are the bacteria involved in nitrification?
A
• Nitrosomonas - oxidises ammonium compounds into nitrites (NO2^-)
• Nitrobacter - oxidises nitrites into nitrates (NO3^-)
4
Q
What are the stages of the nitrogen cycle?
A
• Nitrogen fixation
• Nitrification
• Ammonification
• Denitrification
5
Q
Where is azotobacter found?
A
Free living in the soil
6
Q
Where is rhizobium found?
A
In root nodules of plants
7
Q
What does nitrosomonas do?
A
Oxidises ammonium compounds into nitrites (NO2^-)
8
Q
What does nitrobacter do?
A
Oxidises nitrites into nitrates (NO3^-)
