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Vocabulary
Nitrogen Cycle and Nitrogen Fixation
True or False
Nitrogen Fixation
Misc.
100
____ _____ is the movement of nitrogen between the enviroment and living things.
What is nitrogen cycle.
100

What element do organisms need to build proteins and DNA for new cells?

Nitrogen

100

When organisms die, decomposers break down the remains.

T

100
Around what percent of Earth atmosphere is nitrogen gas?
About 78%
100
What takes nitrogen up from the soil to the plant?
The roots.
200
Nitrogen is not a compound but an......
What is an element.
200
Animals get nitrogen from what?
What is plants.
200
Two types of decomposers are worms and flowers.
F, flowers are not decomposers.
200
Can most organisms use nitrogen gas directly?
No.
200
Without _____ nitrogen could not enter living things or be returned to the atmosphere.
Bacteria
300
____ ____ is bacteria in the soil that is able to change nitrogen gas into forms that plants can use.
What is nitrogen fixation.
300
____ in soil can convert nitrogen back to a gas.
What is bacteria
300
Fire is a way to break down organic matter.
T
300
Name two ways in which organisms get the nitrogen they need.
Eating plants or eating organism that eat plants.
300
Many _____ pass from soil to plants to animals and back.
Nutrients
400
The breakdown of substances into simpler molecules is called what?
What is decomposition.
400
____ causes some nitrogen fixation.
What is lightning
400
Certain types of bacteria in the soil converts nitrogen to a gas, which is returned to the organism.
F, nitrogen in it's gas form cannot be used by an organism.
400
Is a relatively small amount of ammonia produced by lightning?
Yes.
400
What carries nitrogen and carbon sometimes?
What is water.
500
Any complete round or series of occurences that repeats or is repeated.
What is a cycle.
500

____ releases nitrogen into the soil.

What is decomposition.

500
Calcium and Vitamin D are examples of what living cells need.
F
500
Do you think photosynthetic bacteria is an example of nitrogen fixation?
Yes.
500
What happens when an organism dies?
It is likely to be recycled or reused.