MCQ Questions on Nitrogen Cycle

MCQ Questions on Human Physiology

1. Which of the following statements is correct?
(a) Atmosphere is the major reservoir for plants
(b) Nitrogen is the most abundant nutrient for plants
(c) Nitrogen cycle is a sedimentary cycle
(d) All

Answer

Answer: (a) Atmosphere is the major reservoir for plants


2. Nitrogen is absorbed by the plants in the form of
(a) Ammonium
(b) Nitrites
(c) Nitrates
(d) All

Answer

Answer: (d) All


3. Nitrogen fixation is the conversion of
(a) Nto N
(b) Nto NH3
(c) Nto NO3
(d) Nto urea

Answer

Answer: (b) Nto NH3


4. Important enzymes involved in nitrogen fixation are
(a) Nitrogenase and hydrogenase
(b) Nitrogenase and hexokinase
(c) Nitrogenase and peptidase
(d) Nitrogenase and hydrolyase

Answer

Answer: (a) Nitrogenase and hydrogenase


5. Symbiotic nitrogen-fixing cyanobacteria are not present in
(a) Azolla
(b) Gnetum
(c) Anthoceros
(d) Cycas

Answer

Answer: (b) Gnetum


6. How many molecules of ATP are required to fix one molecule of nitrogen?
(a) 12
(b) 20
(c) 6
(d) 16

Answer

Answer: (d) 16


7. Ammonification is the formation of
(a) Ammonia from nitrates by decomposers
(b) Ammonia from nitrogen
(c) Ammonia from amino acids
(d) Ammonia from nitrates by nitrogen fixers

Answer

Answer: (c) Ammonia from amino acids


8. Conversion of nitrates to nitrogen is called
(a) Ammonification
(b) Nitrification
(c) Nitrogen fixation
(d) Denitrification

Answer

Answer: (d) Denitrification


9. Conversion of nitrites to nitrates is called
(a) Nitrosococcus
(b) Clostridium
(c) Nitrobacter
(d) Nitrosomonas

Answer

Answer: (c) Nitrobacter


10. Conversion of ammonia to nitrite and then to nitrates is called
(a) Ammonification
(b) Denitrification
(c) Assimilation
(d) Nitrification

Answer

Answer: (d) Nitrification


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