MCQ Questions on Nitrogen Cycle

MCQ Questions on Nitrogen Cycle

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Biology is the study of life. Below, You will find a list of Biology MCQ Questions as per the latest prescribed syllabus. Ace up your preparation with the Objective Questions available on Human Physiology and enhance your subject knowledge. Understand the concept clearly by consistently practicing the Multiple Choice Questions and score well in your exams.

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) N2 to N
(b) N2 to NH3
(c) N2 to NO3–
(d) N2 to urea

Answer

Answer: (b) N2 to 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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