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- 1. Multiple Choice
Roughly how much of the atmosphere is composed of nitrogen gas?
87%
38%
78%
21%
- 2. Multiple ChoiceHow do plants get the nitrogen they need?from the airfrom the soil or water in which they livefrom the Sunfrom broken-down rocks
- 3. Multiple ChoiceThe swelling on the roots of a soybean are calledNoodlesNitrogenNodulesLegumes
- 4. Multiple Choice
Which of the following describes the role of nitrogen-fixing bacteria in the nitrogen cycle? Nitrogen-fixing bacteria convert....
nitrates intro nitrogen gas
ammonia into proteins
nitrogen gas into ammonium ions
proteins into nitrates
- 5. Multiple Choice
Animals obtain the nitrogen they need directly from the
soil in their habitat
air they breathe
plants and/or animals they eat
bacteria living within them
- 6. Multiple Choice
Organisms require nitrogen to make which of the following?
glucose and starch
lipids and nucleic acids
proteins and nucleic acids
carbohydrates and proteins
- 7. Multiple Choice
Nitrogen fixation involves nitrogen from which of the following sources?
lightning
fertilizers
dead plants
atmosphere
- 8. Multiple Choice
Which group of bacteria convert ammonium ions to Nitrite and Nitrate ions?
Denitrifying
Nitrifying
Nitrogen-fixing
- 9. Multiple Choice
Which group of bacteria convert nitrogen gas in to ammonium ions?
Denitrifying
Nitrifying
Nitrogen-fixing
- 10. Multiple Choice
Which group of bacteria require aerobic conditions in order to oxidise nitrites to nitrates?
Denitrifying
Nitrifying
Nitrogen-fixing
Saprobiotic
- 11. Multiple Choice
Which group of plants contain symbiotic nitrogen fixing bacteria?
Saprobionts
Nitrogen fixing
Leguminous
- 12. Multiple Choice
Which of the following do not contain nitrogen atoms?
carbohydrates
enzymes
antibodies
urea
- 13. Multiple Choice
What is the source of nitrogen for denitrifying bacteria?
nitrogen
urea
dead animals
nitrates
- 14. Multiple Choice
Which group of bacteria are adapted to living in anoxic waterlogged soils, "stripping" the oxygen from nitrates and releasing nitrogen gas?
nitrifying bacteria
denitrifying bacteria
nitrogen fixing
- 15. Multiple Choice
Would a woodlouse be considered a 'decomposer' or a 'saprotroph'?
Decomposer
Saprotroph
- 16. Multiple Choice
Which is the correct formula for ammonium ions?
NH3
NH4+
NH3-
NH4
- 17. Multiple Choice
Which of the following species of bacteria is a nitrifier?
Rhizobium
Nitrosomonas
Azotobacter
Salmonella
- 18. Multiple Choice
Which of the following species can be found in the root nodules of leguminous plants and is involved in nitrogen-fixation?
Rhizobium
Nitrosomonas
Azotobacter
Salmonella
- 19. Multiple Choice
Which of the following species is NOT a nitrifying bacterial species?
Rhizobium
Nitrosomonas
Nitrobacter
- 20. Multiple Choice
Which is the best statement?
Digestive enzymes break down DNA into nucleic acids
Digestive enzymes hydrolyse DNA into nucleic acids
- 21. Multiple Choice
Is the nitrification of ammonium ions to nitrite ions a reduction or oxidation reaction?
Reduction
Oxidation
- 22. Multiple Choice
Which is the correct sequence of chemical changes that occurs during nitrification?
NH4+ 🡪 NO2- 🡪 NO3-
NO3- 🡪 NO2- 🡪 NH4+
NH4+ 🡪 NO3- 🡪 NO2-
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