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171. The Nitrogen Cycle
Test Description: ScienceStudyGames.com
Instructions: Answer all questions to get your test result.
1) According to the video, ________________is essential to life on earth.
A
oxygen
B
carbon dioxide
C
nitrogen
D
water
2) Nitrogen is necessary for both plants and _____________ to live and grow.
A
mammals
B
bugs
C
worms
D
animals
3) Nitrogen is needed for our bodies to make ___________. Therefore, nitrogen is called the “building blocks of life”.
A
new cells
B
heat
C
protein
D
blood
4) Nitrogen makes up around _____________of the air around us.
A
90 percent
B
20 percent
C
80 percent
D
50 percent
5) Plants and animals can or can not use nitrogen directly from the air.
A
can not
B
can
6) Plants receive needed nitrogen from the ___________.
A
sun
B
water
C
ground
D
air
7) Animals get their needed nitrogen from ___________the plants that contain the nitrogen.
A
smelling
B
growing
C
eating
D
buying
8) The process for turning the nitrogen in the atmosphere into a usable form of nitrogen is called_____________.
A
planting
B
chopping
C
breaking
D
fixing
9) The legume family, such as beans, peas and clover, ____________the process using their root nodules to absorb nitrogen.
A
control
B
help
C
hurt
D
damage
10) Another way to get the nitrogen in the soil is by living things_______________ and returning the nitrogen to the soil.
A
planting plants
B
fixing
C
moving
D
decomposing
11) Lightning also helps by producing nitrous oxide to the air and then falling to the ground, in rain, in the form of Nitric Acid.
A
False
B
True
12) Fertilizer added to the soil accounts for about 30 percent of nitrogen____________.
A
depletion
B
fixing
C
damage
*select an answer for all questions
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