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WorksheetsBiogeochemical Cycles Review
Total questions: 21
Worksheet time: 20mins
Name
Class
Date
1.
What is this a picture of?
a)
Nitrogen cycle
b)
carbon cycle
c)
water cycle
d)
plant cycle
2.
How does N2 get into soil?
a)
N2 diffuses into the pore spaces between the soil particles
b)
Legumes pull it in.
c)
gravity. It's not just a good idea, it's the Law.
d)
1st Law of Thermodynamics
3.
How does carbon dioxide leave the atmosphere?
a)
Through transpiration
b)
Through photosynthesis
c)
Through factory emission
d)
Sunlight
4.
Which process takes Carbon Dioxide from the air and converts it into a form of carbon used by living things?
a)
Precipitation
b)
Photosynthesis
c)
Respiration
d)
Bioremdiation
5.
These gases, such as carbon dioxide, trap heat in the Earth's atmosphere causing global warming
a)
Global warming gases
b)
Hot House gases
c)
Green House gases
d)
Thermal pollution
6.
The elements carbon, oxygen, hydrogen and nitrogen combined make up about 96% of our bodies (carbon is about 18%). Carbon is necessary for life because it is a(n)
a)
uncommon element in all living things.
b)
element found only in the atmosphere
c)
excellent bonder
d)
is found mostly in dead things.
7.
Respiration is the process by which ____________ is consumed and _______________ is produced.
a)
Carbon, Oxygen
b)
Oxygen, Carbon dioxide
c)
H20, oxygen
d)
Carbon, H2O
8.
A particular golf course is using large amounts of nitrogen fertilizer. What process could move this nitrogen into a local stream?
a)
volatilization
b)
nitrogen fixation
c)
runoff
d)
ammonification
9.
Growing legumes such as alfalfa or soy beans increases
a)
denitrification
b)
nitrogen fixation
c)
ammonification
d)
ammonium oxidation
10.
Which of the following describes the role of nitrogen-fixing bacteria in the nitrogen cycle? Nitrogen-fixing bacteria convert
a)
nitrates intro nitrogen gas
b)
ammonia into proteins
c)
nitrogen gas into ammonia
d)
proteins into nitrates
11.
Organisms use nitrogen to form
a)
carbohydrates and lipids
b)
proteins and lipids
c)
lipids and nucleic acids
d)
proteins and nucleic acids
12.
The nitrogen cycle is a biogeochemical cycle because it moves ?
a)
only between living things (biosphere)
b)
only in the soil (geosphere)
c)
between the 4 different spheres
d)
only in the air (atmosphere)
13.
When nitrogen gas is turned in to a form that plants and animals can use is called
a)
Combustion
b)
Photosynthesis
c)
Decomposition
d)
Nitrogen Fixation
14.
What happens when organisms die and decay?
a)
Their nitrogen moves to the air as nitrogen gas
b)
Their nitrogen returns to the soil as ammonium
c)
Their nitrogen becomes tapped in clay and is unusable
d)
They stay on earth forever
15.
Carbon dioxide is added to the atmosphere by
a)
Burning fossil fuels
b)
Cellular respiration
c)
Decomposing organic matter
d)
All answers are correct
16.
During photosynthesis, carbon is moved from which reservoir (sink) to which reservoir (sink)?
a)
From the atmosphere to the terrestrial biosphere.
b)
From the troposphere to the terrestrial biosphere.
c)
From the lithosphere to the terrestrial biosphere.
d)
From the hydrosphere to the terrestrial biosphere
17.
Which of the following processes converts C6H12O6 to an inorganic molecule CO2
a)
translation
b)
photosynthesis
c)
cellular respiration
d)
excretion
18.
Denitrifying bacteria convert
a)
NH4+ to N2
b)
NH4+ to NO3
c)
N2 to NH4+
d)
none of these
19.
If the atmosphere is 78% N2, why can't we just get our nitrogen by breathing?
a)
We have no mechanism to break the triple bond of nitrogen between the atoms.
b)
Our lungs would be damaged by the N2.
c)
We need Oxygen for cellular respiration.
d)
The legumes take it up first.
20.
A chlorophyll molecule, the plant pigment that facilitates photosynthesis, is necessary to all plants. Elements in chlorophyll include carbon and
a)
aluminum
b)
boron
c)
nitrogen
d)
iron
21.
Eutrophication is a man made source too much
a)
oxygen in the atmosphere
b)
phosphorus in the geopsphere
c)
Nitrates in the hydrosphere
d)
carbon in the atmosphere
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