nitrogen cycle

Question 1

what are the 3 bacterias in the nitrogen cycle

Answer 1

• decomposing bacteria
• nitrifying bacteria
• denitrifying bacteria

Question 2

what are the 5 stages of the nitrogen cycle

Answer 2

-nitrogen fixation
- nitrification
- assimilation
- ammonification
- denitrification

Question 3

nitrogen fixation

Answer 3

nitrogen gas from the atmosphere is converted into ammonia or ammonium by bacteria in soil and root nodules. This happens because plants can’t directly use nitrogen gas

Question 4

purpose of nitrogen fixation

Answer 4

to convert nitrogen gas into ammonium which plants can absorb

Question 5

nitrification

Answer 5

ammonium is converted into nitrites and then into nitrates by nitrifying bacteria in the soil

Question 6

purpose of nitrification

Answer 6

produce a form of nitrogen which plants can absorb

Question 7

assimilation

Answer 7

plants absorb nitrates and then use them to build proteins. Animals then eat the plants to get nitrogen, and thats how nitrogen enters the food chain

Question 8

ammonification

Answer 8

decomposers break down dead organisms & waste, turning proteins into ammonium, which is returned to the soil

Question 9

denitrification purpose

Answer 9

completes nitrogen cycle and prevents build up of nitrates in soil

Question 10

denitrification

Answer 10

nitrates and other nitrogen compounds are converted back into nitrogen gas by denitrifying bacteria.