The Nitrogen Cycle

Question 1

How much of the atmosphere is Nitrogen?

Answer 1

78%

Question 2

What is Nitrogen Fixation

Answer 2

When N2 from the air is turned into nitrogen compounds that can be used in the soil by plants.

Question 3

What are Nitrogen Compounds used for?

Answer 3

They are used for DNA and to produce proteins.

Question 4

What turns Nitrogen from atmosphere into Ammonia?

Answer 4

Nitrogen-fixing bacteria

Question 5

What turns the Ammonia into Nitrites then Nitrates?

Answer 5

Nitrifying bacteria

Question 6

Explain an animal’s role in the nitrogen cycle

Answer 6

-The animal eats a plant such as a legume then excretes urea, containing nitrogen compounds

-Bacteria called decomposers break down proteins and urea from rotting animals into Ammonia.

Question 7

What turns nitrates back into nitrogen in the atmosphere?

Answer 7

Denitifying bacteria

Question 8

What can lightning do in the nitrogen cycle?

Answer 8

Turns nitrogen into nitrates that can be used in the soil by plants for DNA and Proteins.

Question 9

Why is Denitrifying bacteria not good for living organisms?

Answer 9

Because it reduces the nitrate concentration in the soil.

Question 10

Name the 4 different types of bacteria in the Nitrogen Cycle

Answer 10

-Decomposers, Nitrogen-fixing bacteria, Denitrifying bacteria, Nitrifying Bacteria.