The Nitrogen Cycle
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Question 1 of 30
1. Question
During nitrogen fixation, atmospheric nitrogen is converted into…
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Question 2 of 30
2. Question
N2 gas makes up about ——- % of Earth’s atmosphere by volume.
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Question 3 of 30
3. Question
Which of these are an important source of N2?
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Question 4 of 30
4. Question
Nitrogen fixation is the conversion of…
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Question 5 of 30
5. Question
The major amount of nitrogen in nature is fixed by…
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Question 6 of 30
6. Question
The major enzymes involved in biological nitrogen fixation are…
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Question 7 of 30
7. Question
The Haber Process combines atmospheric nitrogen with hydrogen from natural gas, producing ammonia in the presence of an…
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Question 8 of 30
8. Question
Which microorganisms are an essential part of the nitrogen cycle?
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Question 9 of 30
9. Question
Conversion of N≡N to NH3 occurs in plant cells by…
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Question 10 of 30
10. Question
Nitrification happens in _____?
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Question 11 of 30
11. Question
What molecules do plants produce using nitrogen?
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Question 12 of 30
12. Question
Which reaction shown below is carried out by denitrifying bacteria?
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Question 13 of 30
13. Question
Which group of bacteria uses nitrogen gas from the air to produce their own nitrate?
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Question 14 of 30
14. Question
Nitrogen is a key element for…
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Question 15 of 30
15. Question
Nitrogenase is an enzyme complex with——– metal components
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Question 16 of 30
16. Question
Which of the following is a symbiotic nitrogen-fixing microorganism?
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Question 17 of 30
17. Question
Biological nitrogen fixation is an energetically expensive process because ——– molecules are needed to break down an N2 molecule.
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Question 18 of 30
18. Question
Nitrogen-fixing organisms can be classified into…
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Question 19 of 30
19. Question
Symbiotic nitrogen-fixing bacteria are found in…
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Question 20 of 30
20. Question
Nitrogenase is inactivated in aerobic environments because it is extremely ——– sensitive.
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Question 21 of 30
21. Question
Denitrification is catalysed by…
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Question 22 of 30
22. Question
Nitrosomonas and Nitrobacter are examples of ——- bacteria
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Question 23 of 30
23. Question
Nitrogen-fixing bacteria fix ——– % of nitrogen gas in the atmosphere.
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Question 24 of 30
24. Question
The nitrogen cycle is completed by———— , where nitrate is converted back into nitrogen gas.
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Question 25 of 30
25. Question
The process in which nitrogen circulates and is recycled is called…
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Question 26 of 30
26. Question
The conversion of amino acids to ammonium by soil decomposers is called?
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Question 27 of 30
27. Question
Why do decomposers break down plant and animal waste products?
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Question 28 of 30
28. Question
Plants cannot absorb molecular N2 in the atmosphere because…
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Question 29 of 30
29. Question
All the following are free living N2 fixers except…
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Question 30 of 30
30. Question
Anabaena, a N2 fixer, is present in the root pockets of…
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