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NITROGEN CYCLE MCQs

Total Questions : 26 | Page 2 of 3 pages
Question 11. Bacteria fix nitrogen from the atmosphere into a form plants can use
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 12. What is the formula for atmospheric nitrogen?
  1.    N
  2.    N2
  3.    NH3
  4.    NO3
 Discuss Question
Answer: Option B. -> N2
Question 13. What happens when organisms die and decay?
  1.    Their bodies are lifted up
  2.    Their nitrogen returns to the soil
  3.    they keep their nitrogen
  4.    They stay on earth forever
 Discuss Question
Answer: Option B. -> Their nitrogen returns to the soil
Question 14. _____ is the conversion of organic nitrogen into ammonia
  1.    Nitrogen Fixation
  2.    Ammonification
  3.    Denitrification
  4.    Assimilation 
 Discuss Question
Answer: Option B. -> Ammonification
Question 15. What do free living bacteria in the soil do?
  1.    Make clouds
  2.    Turn atmospheric nitrogen into nitrates
  3.    Make carbon dioxide for plants to go through photosynthesis
  4.    Help plants take in water
 Discuss Question
Answer: Option B. -> Turn atmospheric nitrogen into nitrates
Question 16. Can animals and plants directly absorb nitrogen from the atmosphere, is this statement true or false
  1.    False
  2.    True
 Discuss Question
Answer: Option A. -> False
Question 17. Fixation is the process of
  1.    conversion of N2 to forms that can be used to synthesize inorganic nitrogen compounds
  2.    conversion of Co2 to forms that can be used to synthesize organic carbonic compounds
  3.    conversion of N2 to forms that can be used to synthesize organic nitrogen compounds
  4.    conversion of H2O to forms that can be used to synthesize organic aqueous compounds
 Discuss Question
Answer: Option C. -> conversion of N2 to forms that can be used to synthesize organic nitrogen compounds
Question 18. Nitrogen fixation is the
  1.    Conversion of N2(nitrogen) to NO3-(nitrate)
  2.    Conversion of N2 to N
  3.    Conversion of N2 to urea
  4.    All of the above
 Discuss Question
Answer: Option A. -> Conversion of N2(nitrogen) to NO3-(nitrate)
Question 19. Arrange the following process of nitrogen cycle in proper sequence (i)Denitrification(ii)Nitrogen Fixation(iii)Ammonification(iv)Nitrification
  1.    i-iii-iv-i
  2.    i-ii-iii-iv
  3.    iv-iii-ii-i
  4.    All of the above
 Discuss Question
Answer: Option A. -> i-iii-iv-i
Question 20. Nitrogen accounts nearly 78% of the air
  1.    N2 cannot be directly utilized by plants
  2.    High energy is required to break triple bond
  3.    Nitrogen is almost an inert gas as N involved reaction requires extreme conditions such as high temperature
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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