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- 1. Multiple Choice
Which of the following best explains why nitrogen fixation (when bacteria in the soil change atmospheric nitrogen into nitrogen for plants & animals) must take place?
Atmospheric nitrogen is unusable to plants and animals
Nitrogen must be returned to the atmosphere
Animals must breathe in nitrogen
Nitrogen gets "stuck" in the soil and must be untrapped
- 2. Multiple Choice
Decomposers that breaks down dead plants & animals and releases nitrogen back into atmosphere
bacteria
plants
animals
producers
- 3. Multiple Choice
When nitrogen gas is turned in to a form that plants and animals can use is called...
Combustion
Photosynthesis
Decomposition
Nitrogen Fixation
- 4. Multiple Choice
Organisms need nitrogen in order to...
To breathe
To obtain water for growth
To build proteins & DNA
To regulate temperature
- 5. Multiple Choice
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
The process by which waste and dead organisms release nitrogen back into the soil to be used again.DecompositionFixationDenitrificationSublimation - 7. Multiple Choice
In addition to lightning, what are three other ways nitrogen enters the soil and is fixed into a usable form for organisms? (Select THREE answers)
Fertilizers
Decomposition of organic matter
Bacteria fixation
Denitrification
Plant consumption
- 8. Multiple Choice
Which of the following organisms are essential for the nitrogen cycle?
Bacteria
Plants
Animals
People
- 9. Multiple Choice
Nitrogen-fixing bacteria are found in...
root nodules of legumes
plants
animals
decomposers
- 10. Multiple Choice
What is the only form of nitrogen that non-legume plants can take in and use?
Nitrates
Nitrites
Diatomic nitrogen
Ammonium
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