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- 1. Multiple Choice
What converts nitrogen gas into a usable form for plants and animals?
bacteria
rain
fungi
car exhaust
- 2. Multiple Choice
Organisms that need nitrogen to survive.
only plants
only animals
only bacteria
all living things
- 3. Multiple Choice
How is nitrogen "fixed" into a usable form for plants?
Through action of bacteria only
Through lightning only
Through action of bacteria and lightning
Through photosynthesis
- 4. 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
- 5. Multiple Choice
Gas that makes up 78% of our atmosphere.
Oxygen
Nitrogen
Hydrogen
Carbon Dioxide
- 6. Multiple Choice
What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?
nitrogen composition
nitrogen fixation
ammonia
denitrification
- 7. Multiple Choice
What is the formula for atmospheric nitrogen?
N
N2
NH3
NO3
- 8. Multiple Choice
What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere?
Assimilation
Fixation
Ammonification
Denitrification
- 9. Multiple Choice
Plants and animals cannot use nitrogen directly from the air.
True
False
- 10. Multiple Choice
In the nitrogen cycle, what does label A in the diagram represent?
Gas
Clouds
Carbon dioxide in the atmosphere
Nitrogen in the atmosphere
- 11. Multiple Choice
What is the role of denitrifying bacteria
change nitrate back into nitrogen gas
change nitrogen gas into nitrate
absorb carbon dioxide in the soil
release oxygen gas into the atmosphere
- 12. Multiple Choice
Round structures on the roots of certain plants like legumes that have nitrogen fixing bacteria
lichens
commensals
cataracts
nodules
- 13. Multiple Choice
Where can nitrogen fixing bacteria be found
Free living in the soil
under the leaves of flowering plants
in the atmosphere
living on the nodules of certain plants
- 14. Multiple Choice_____ is the conversion of organic nitrogen into ammoniaNitrogen FixationAmmonificationDenitrificationAssimilation
- 15. Multiple ChoiceNitrification happens in the ______AirSoilGround WaterPlants
- 16. Multiple Choice
A useable form of nitrogen that plants absorb...
nitrates
nitrogen fixing bacteria
animals
decomposers
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