Nitrogen Cycle(General Knowledge > General Science ) Questions and Answers

Question 1. What converts nitrogen gas into a usable form for plants and animals?
  1.    bacteria
  2.    rain
  3.    fungi
  4.    car exhaust
Explanation:-
Answer: Option A. -> bacteria
Question 2. Round structures on the roots of certain plants
  1.    lichens
  2.    commensals
  3.    cataracts
  4.    nodules
Explanation:-
Answer: Option D. -> nodules
Question 3. Where can nitrogen fixing bacteria be found
  1.    Free living in the soil
  2.    living on the nodules of certain plants
  3.    in the atmosphere
  4.    Both A & B
Explanation:-
Answer: Option D. -> Both A & B
Question 4. How does fertilizer affect the nitrogen cycle
  1.    cause nitrous oxide, a greenhouse gas, to enter the atmosphere and trap heat
  2.    create large algae blooms in the water
  3.    cause the nitrogen fixing bacteria in the soil to be less productive
  4.    All Of above
Explanation:-
Answer: Option D. -> All Of above
Question 5. What plants help or are beneficial to the nitrogen cycle?
  1.    peas
  2.    clover
  3.    peanuts
  4.    All Of above
Explanation:-
Answer: Option D. -> All Of above
Question 6. What is the role of denitrifying bacteria
  1.    change nitrate back into nitrogen gas
  2.    change nitrogen gas into nitrate
  3.    absorb carbon dioxide in the soil
  4.    release oxygen gas into the atmosphere
Explanation:-
Answer: Option A. -> change nitrate back into nitrogen gas
Question 7. Burning fossil fuels releases this into the air
  1.    nitrous oxide
  2.    nitrate
  3.    nitrogen gas (N2)
  4.    methane
Explanation:-
Answer: Option A. -> nitrous oxide
Question 8. This can transform nitrogen in the atmosphere into a usable form of nitrogen
  1.    rain
  2.    ice
  3.    lightning
  4.    sun
Explanation:-
Answer: Option C. -> lightning
Question 9. Plants and animals need nitrogen to make __________
  1.    Protein
  2.    Carbohydrates
  3.    Lipids
  4.    Minerals
Explanation:-
Answer: Option A. -> Protein
Question 10. The process in which nitrogen circulates and is recycled is called
  1.    The nitrogen cycle
  2.    The carbon cycle
  3.    The water cycle
  4.    The phosphorus cycle
Explanation:-
Answer: Option A. -> The nitrogen cycle
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