Nitrogen Cycle -Multiple Choice Questions Quiz

Interactive MCQs on “Nitrogen Cycle”:

Solve the following 10 questions. Only one option is correct. Click on the “Submit” button when done. Click on the “embed” button to use this quiz on your website. Click on “WhatsApp” to share this quiz.

Question 1:What is the nitrogen cycle?

(A) Movement of nitrogen through the environment
(B) Movement of oxygen in the air
(C) Process of photosynthesis
(D) Water cycle

Question 2:What percentage of Earth’s atmosphere is nitrogen?

(A) 0.21
(B) 0.78
(C) 0.5
(D) 0.1

Question 3: Why do living organisms need nitrogen?

(A) To produce oxygen
(B) To store energy
(C) To make proteins and DNA
(D) To make glucose

Question 4:What is nitrogen fixation?

(A) Conversion of ammonia to nitrogen gas
(B) Absorption of nitrogen by plants
(C) Breakdown of dead organisms
(D) Conversion of nitrogen gas into ammonia

Question 5:Which organisms are responsible for nitrogen fixation?

(A) Bacteria
(B) Fungi
(C) Plants
(D) Animals

Question 6:What is the process by which plants absorb nitrogen?

(A) Nitrogen fixation
(B) Assimilation
(C) Nitrification
(D) Denitrification

Question 7:What happens during nitrification?

(A) Conversion of nitrogen gas into ammonia
(B) Absorption of nitrogen by plants
(C) Conversion of ammonia into nitrates
(D) Breakdown of nitrogen compounds by decomposers

Question 8:What is denitrification?

(A) Conversion of nitrogen into proteins
(B) Absorption of nitrogen by roots
(C) Conversion of ammonia into nitrates
(D) Conversion of nitrates into nitrogen gas

Question 9:Which human activities impact the nitrogen cycle?

(A) Use of fertilizers and burning fossil fuels
(B) Cutting down trees
(C) Producing oxygen
(D) Growing crops without fertilizers

Question 10:How does nitrogen return to the soil from dead organisms?

(A) Photosynthesis
(B) Decomposition
(C) Denitrification
(D) Nitrification