Nitrogen Cycle

Question 1

What is the primary gas that makes up the Earth’s atmosphere?

Answer 1

Nitrogen

Question 2

True or False: Nitrogen is directly usable by plants in its gaseous form.

Answer 2

False

Question 3

Fill in the blank: The process by which nitrogen gas is converted into ammonia is called __________.

Answer 3

nitrogen fixation

Question 4

Which organisms are primarily responsible for nitrogen fixation in the soil?

Answer 4

Certain bacteria, such as Rhizobium

Question 5

What is the process called where ammonia is converted into nitrites and then nitrates?

Answer 5

nitrification

Question 6

Multiple Choice: Which of the following is a step in the nitrogen cycle? A) Photosynthesis B) Nitrification C) Respiration

Answer 6

B) Nitrification

Question 7

What is the term for the process where nitrates are converted back into nitrogen gas?

Answer 7

denitrification

Question 8

True or False: Ammonia can be taken up directly by plants.

Answer 8

True

Question 9

Short Answer: Name one human activity that can disrupt the nitrogen cycle.

Answer 9

Fertilizer application

Question 10

What role do decomposers play in the nitrogen cycle?

Answer 10

They break down organic matter, releasing nitrogen back into the soil.