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WorksheetsSCIENCE CH 21 (LESSONS 1-3)
Total questions: 47
Worksheet time: 11hrs 2mins
Name
Class
Date
1.
Where do animals get nitrogen from?
a)
soil
b)
air
c)
water
d)
plants
2.
What are two places that nitrogen can be stored?
a)
Leaves and soil
b)
Soil and water
c)
Leaves and stems
d)
People and water
3.
Plants remove gas from the air, what do they do next?
a)
They make it into soil
b)
They make living organisms
c)
They transform it into chemicals
d)
The plant makes a unicorn
4.
What is the symbol for nitrogen?
a)
No2
b)
Ni2
c)
N2
5.
What removes nitrogen from the air?
a)
Tiny organisms, plants, animals, and soil
b)
Just plants
c)
Animals inhaling air and plants
d)
Liquid water and plants
6.
What happens to the nitrogen excreted by animals?
a)
Nitrates are reabsorbed by the animal.
b)
Nitrogen is converted into ammonia.
c)
Nitrogen is released back into the environment.
d)
Nitrates are converted into proteins.
7.
True or False? Nitrogen is essential to all living things.
a)
True
b)
False
8.
True or False? 88 percent of the earth's atmosphere is made up of nitrogen.
a)
True
b)
False
9.
What percent of the earth's atmosphere is made up of nitrogen?
a)
88%
b)
78%
c)
68%
d)
58%
10.
Plants make proteins from nitrogen in the ___________.
a)
air
b)
soil
c)
mud
d)
water
11.
How are nitrates and ammonia returned to the soil?
a)
through animal waste
b)
when animals and plants die
c)
both through animal waste and when animals and plants die
d)
when flowers bloom
12.
What do nitrification and denitrification have in common?
a)
Both processes are carried out by birds
b)
Both processes are carried out by animals
c)
Both processes are carried out by bacteria
13.
Nitrogen is fixed through _____________.
a)
air
b)
birds
c)
thunder
d)
lightening
14.
In the nitrogen cycle, nitrogen gas is fixed into forms of nitrogen that can be used by __________.
a)
plants
b)
sun
c)
moon
d)
cats
15.
What is an effect of humans adding excess nitrogen to the nitrogen cycle?
a)
water quality degradation, algae blooms, habitat loss
b)
habitat loss, algae blooms, water purification
16.
All ________________ are made of carbon.
a)
street signs
b)
living things
c)
basketballs
d)
dead things
17.
How is carbon returned back to the soil?
a)
through the decaying of dead plants and animals
b)
only plants
c)
only animals
18.
Fossil fuels are made by the decaying of plants and animals over _________ years.
a)
several
b)
many
c)
thousands of
d)
millions of
19.
What happens when we burn fossil fuels?
a)
Oxygen is released into the atmosphere.
b)
Nitrogen is released into the atmosphere.
c)
CO2 is released into the atmosphere.
20.
True or False? Animals release CO2 into the atmosphere through cellular respiration.
a)
true
b)
false
21.
What are the two things that must fix the Nitrogen so that plants and animals can use it?
a)
lightening and bacteria in the soil and on the nodules of legume plants
b)
rainwater and bacteria in the soil and on the nodules of legume plants
c)
dirt and bacteria in the soil and on the nodules of legume plants
22.
What is the process where dead animals and plants release Nitrogen back into the soil where bacteria uses the Nitrogen to convert it to ammonium (nitrogen + hydrogen)?
a)
denitrification
b)
ammonification
23.
Which of the following has biotic factors?
a)
water
b)
humans
c)
rocks
d)
shells
24.
Which of the following has abiotic factors?
a)
human
b)
shell
c)
dog
d)
plant
25.
What is it called when a solid turns into a gas without going through the liquid state?
a)
sublimation
b)
oxygenation
c)
diffusion
d)
confusion
26.
What is the earth's energy source?
a)
the moon
b)
the sun
c)
the earth
d)
the animals
27.
What stages of the water cycle are being worked on by gravity?
a)
precipitation, surface run-off, and infiltration
b)
precipitation, evaporation, and infiltration
c)
precipitation, surface run-off, and evaporation
28.
What is A?
a)
combustion
b)
animal respiration
c)
dissolving
d)
plant respiration
29.
What is B?
a)
combustion
b)
animal respiration
c)
photosynthesis
d)
dissolving
30.
What is C?
a)
combustion
b)
animal respiration
c)
photosynthesis
d)
plant respiration
31.
What is D?
a)
plant respiration
b)
combustion
c)
animal respiration
d)
dissolving
32.
What is E?
a)
plant respiration
b)
animal respiration
c)
dissolving
d)
photosynthesis
33.
What is A?
a)
Nitrogen fixing bacteria on legume plant roots
b)
nitrification
c)
nitrites
34.
What is B?
a)
Nitrogen fixing bacteria on legume plant roots
b)
Nitrogen gas in the atmosphere
c)
Nitrites
35.
What is C?
a)
Ammonium
b)
Decomposers
c)
nitrates
36.
What is D?
a)
Ammonification
b)
Nitrates
c)
Denitrification
37.
What is E?
a)
Nitrification
b)
Denitrification
c)
Ammonium
38.
What is F?
a)
Decomposers
b)
Ammonium
c)
Nitrites
39.
What is the light blue part?
a)
tundra
b)
deciduous forest
c)
grassland
40.
What is the yellow part?
a)
tundra
b)
deciduous forest
c)
grassland
41.
What is the lime green part?
a)
tundra
b)
deciduous forest
c)
grasslands
42.
What is the orange section?
a)
desert
b)
tropical rain forest
c)
salt water
43.
What is the dark purple area at the very bottom of the diagram?
a)
desert
b)
tropical rain forest
c)
freshwater
44.
What are the pink sections?
a)
desert
b)
tropical rain forest
c)
fresh water
45.
What are the dark blue sections around the outside of the map?
a)
temperate rain forest
b)
salt water
c)
taiga
46.
What is the brown part?
a)
salt water
b)
temperate rain forerst
c)
taiga
47.
What are the dark green parts?
a)
salt water
b)
temperate rain forest
c)
taiga
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