171. The Nitrogen Cycle Question Preview (ID: 51062)


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According to the video, ________________is essential to life on earth.
a) nitrogen
b) water
c) oxygen
d) carbon dioxide

Nitrogen is necessary for both plants and _____________ to live and grow.
a) mammals
b) animals
c) bugs
d) worms

Nitrogen is needed for our bodies to make ___________. Therefore, nitrogen is called the “building blocks of life”.
a) protein
b) new cells
c) blood
d) heat

Nitrogen makes up around _____________of the air around us.
a) 20 percent
b) 50 percent
c) 90 percent
d) 80 percent

Plants and animals can or can not use nitrogen directly from the air.
a) can
b) can not
c)
d)

Plants receive needed nitrogen from the ___________.
a) sun
b) ground
c) water
d) air

Animals get their needed nitrogen from ___________the plants that contain the nitrogen.
a) growing
b) smelling
c) eating
d) buying

The process for turning the nitrogen in the atmosphere into a usable form of nitrogen is called_____________.
a) chopping
b) planting
c) fixing
d) breaking

The legume family, such as beans, peas and clover, ____________the process using their root nodules to absorb nitrogen.
a) help
b) hurt
c) damage
d) control

Another way to get the nitrogen in the soil is by living things_______________ and returning the nitrogen to the soil.
a) fixing
b) moving
c) decomposing
d) planting plants

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) True
b) False
c)
d)

Fertilizer added to the soil accounts for about 30 percent of nitrogen____________.
a) damage
b) fixing
c) depletion
d)

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