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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
The process in which nitrogen circulates and is recycled is called
The nitrogen cycle
The carbon cycle
The water cycle
The phosphorus cycle
- 3. Multiple Choice
Organisms that need nitrogen to survive.
only plants
only animals
only bacteria
all living things
- 4. 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
- 5. 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
- 6. Multiple Choice
Gas that makes up 78% of our atmosphere.
Oxygen
Nitrogen
Hydrogen
Carbon Dioxide
- 7. 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
- 8. Multiple Choice
What is the formula for atmospheric nitrogen?
N
N2
NH3
NO3
- 9. Multiple Choice
What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere?
Assimilation
Fixation
Ammonification
Denitrification
- 10. Multiple Choice
Plants and animals cannot use nitrogen directly from the air.
True
False
- 11. Multiple Choice
Bacteria fix nitrogen from the atmosphere into a form plants can use.
True
False
- 12. 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
- 13. Multiple ChoicePlants and animals need nitrogen to make __________.ProteinCarbohydratesLipidsMinerals
- Answer choicesTagsAnswer choicesTags