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The Carbon And Nitrogen Cycle
Test Description: Review Questions for the carbon and nitrogen cycle test.
Instructions: Answer all questions to get your test result.
1) Which below does NOT describe nitrogen?
A
Most organisms can get the nitrogen they need from the atmosphere.
B
It is an element.
C
It makes up about 78% of the gasses in our atmosphere.
D
All living things need nitrogen to build proteins and other important body chemicals.
2) Nitrogen which is not combined with any other element is
A
isotope nitrogen
B
free nitrogen
C
uncombined nitrogen
D
released nitrogen
3) What must happen to free nitrogen before organisms can use it?
A
It must be separated by lightning.
B
It must combined with other elements to create nitrogen compounds.
C
It must be converted into sugars by plants.
D
It must combined with moisture in the atmosphere.
4) What is the nitrogen cycle?
A
Both A and B are correct.
B
A special setting on a washing machine to help clean nitrogen compounds.
C
The path free nitrogen takes from the atmosphere, to living organisms, and back into the atmosphere.
D
A bicycle made of nitrogen.
5) Which way can nitrogen be fixed?
A
By certain types of bacteria.
B
By plants
C
By lightning
D
Both A and C are correct.
6) Where are nitrogen fixing bacteria NOT located?
A
Inside the structures on the roots of certain plants called legumes
B
In the soil.
C
In the water.
D
In the atmosphere.
7) Which below is not an example of a legume.
A
Peas
B
Beans
C
Peanuts
D
Potatoes
8) How do animals get the nitrogen they need?
A
By eating animals.
B
By drinking water.
C
By eating plants.
D
Both A and B.
9) What happens to the nitrogen in animal waste or decomposing organisms.
A
It is released into the ground water in the form of carbohydrates.
B
It is returned to plants in the form of free nitrogen.
C
It is returned to the soil in the form of ammonia.
D
It is released into the atmosphere.
10) Which below is NOT a step in fixing free nitrogen into usable nitrogen.
A
Free nitrogen is converted into ammonium.
B
Ammonium is converted into nitrites.
C
Nitrites are converted into nitrates.
D
Nitrates are converted into carbohydrates through photosynthesis.
11) Which below is NOT true about carbon.
A
Inorganic (carbon dioxide) or organic (sugar).
B
It is an element.
C
It can only be found in its pure form.
D
It is the basis for all living things.
12) The process by which plants take carbon dioxide, water and energy from the sun to produce sugars and oxygen.
A
Cellular Respiration
B
Photosynthesis
C
Transpiration
D
Oxygen Fixing
13) The process by which an organism takes sugar, combines it with oxygen to produce carbon dioxide, water vapor and energy.
A
Transpiration
B
Oxygen Diffusion
C
Cellular Respiration
D
Photosynthesis
14) Anything which releases carbon dioxide into the atmosphere is considered a
A
carbon structure
B
carbon sink
C
carbon source
D
carbon stand
15) Which below is a carbon source?
A
Burning of fossil fuels
B
Decomposition
C
Cellular Respiration
D
All of these are carbon sources.
16) Anything which stores more carbon than it releases is called a
A
carbon sink
B
carbon trap
C
carbon pit
D
carbon resource
17) Why are plants important in the carbon cycle?
A
They produce nitrates, which help with the breakdown of carbon dioxide.
B
They take carbon dioxide and produce energy.
C
They are the first step in getting carbon out of the atmosphere and into the carbon cycle.
D
The release ozone into the atmosphere, which helps with the breakdown of carbon dioxide.
18) How are humans influencing the amount of carbon in the carbon cycle?
A
By removing carbon dioxide from the atmosphere through cellular respiration.
B
Humans are not influencing the amount of carbon dioxide in the atmosphere.
C
By adding carbon dioxide to the atmosphere through the burning of fossil fuels.
D
By adding carbon dioxide to the atmosphere through photosynthesis.
19) What is the largest carbon sink on Earth?
A
Fossil Fuels
B
The Ocean
C
Plants
D
Permafrost
20) How does the ocean influence the amount of carbon dioxide in the atmosphere.
A
Taking carbon dioxide out of the atmosphere through diffusion.
B
Releasing carbon dioxide back into the atmosphere.
C
All three are correct.
D
Taking carbon dioxide out of the atmosphere by phytoplankton to produce sugars through photosynthesis.
*select an answer for all questions
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