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- 1. Multiple Choice
The process in which nitrogen circulates and is recycled is called
The nitrogen cycle
The carbon cycle
The water cycle
The phosphorus cycle
- 2. Multiple Choice
Organisms that need nitrogen to survive.
only plants
only animals
only bacteria
all living things
- 3. Multiple Choice
How do animals get the nitrogen they need?
From the air they breathe
From the water they drink
From the food they eat
From the sun
- 4. Multiple Choice
What is the formula for atmospheric nitrogen?
N
N2
NH3
NO3
- 5. Multiple Choice
Gas that makes up 78% of our atmosphere.
Oxygen
Nitrogen
Hydrogen
Carbon Dioxide
- 6. Multiple Choice
According to this diagram, plants use nitrogen to make _________________________
bacteria
animals
proteins
decomposers
- 7. Multiple Choice
According to this diagram, plants absorb
nitrates
nitrogen fixing bacteria
animals
decomposers
- 8. Multiple Choice
According to this diagram, animals get proteins from eating ________________________
decomposers
bacteria
plants
sunlight
- 9. Multiple Choice
Bacteria fix nitrogen from the atmosphere into a form plants can use.
True
False
- 10. Multiple Choice
What is the process where plants use nitrates to grow?
Nitrogen Fixation
Ammonification
Assimilation
Nitrification
- 11. Multiple Choice
What is the process where bacteria turns Nitrogen gas from the atmospheres into usable compounds?
nitrogen composition
nitrogen fixation
ammonia
denitrification
- 12. Multiple ChoiceOrganisms that break down dead plants & animals and release nitrogen back into atmosphere...bacteriaplantsanimalsproducers
- 13. Multiple ChoicePlants and animals cannot use nitrogen directly from the air.TrueFalse
- 14. Multiple ChoiceWhat happens when organisms die and decay?Their bodies are lifted upTheir nitrogen returns to the soilthey keep their nitrogenThey stay on earth forever
- 15. Multiple Choice
_____ is the conversion of organic nitrogen into ammonia
Nitrogen Fixation
Ammonification
Denitrification
Assimilation
- 16. Multiple ChoiceNitrification happens in the ______AirSoilGround WaterPlants
- 17. Multiple ChoiceOrganisms that play a role in the nitrogen cycleonly plantsonly animalsonly bacteriaplants, animals, & bacteria
- 18. Multiple Choice
What happens when too much Nitrogen finds its way to the ocean?
Algae Bloom
Acid Precipitation
Nitrogen Fixation
Decomposition
- 19. Multiple Choice
What is the main reservoir of nitrogen?
Water bodies
Plants
Atmosphere
Soil
- 20. Multiple Choice
The process that convert nitrates (NO3-) back to nitrogen gas (N2) there by replenishing N2 in the atmosphere is called
Nitrogen fixation
Deamination
Denitrification
Nitrification
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