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Carbon Cycle Quiz - Agriscience
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1. Plants consume most of their carbon from…
a. The air b. The soil c. The water d. None of the above
2. When a human or animal consumes food, the carbon in that food is most likely to be converted into which of
the following elements?
a. Oxygen b. Hydrogen c. Nitrogen d. None of the above; the carbon will remain carbon
3. Which of the following absorbs carbon dioxide (CO2)?
a. Plants b. Animals c. Decomposers d. All of the above
4. When a log is burned in a fire it seems like it loses weight; what happens to its physical mass?
a. It disappears
b. It is released into the air as CO2 and H2O
c. It becomes energy
d. The log does not change weight or size
5. From where does a log primarily obtain its physical mass when it is growing as a tree?
a. From carbon in the soil b. From the sunlight c. From carbon in the air d. From the seed itself
6. The Carbon Cycle is best defined as the process in which…
a. Carbon changes from inorganic forms to organic forms and back
b. Carbon is changed into other elements, including oxygen and hydrogen
c. Carbon is consumed and regenerated from other elements such as oxygen, hydrogen, and nitrogen
d. Carbon is continually created from the sun’s energy by living organisms
7. Organisms such as fungi and microbes that are decomposers will affect the carbon cycle by…
a. Consuming carbon, reducing the total amount of carbon that exists in the cycle
b. Releasing CO2 into the atmosphere, increasing atmospheric levels of carbon
c. Creating carbon from other atomic elements (such as oxygen)
d. None of the above; decomposers do not affect the carbon cycle
8. Photosynthesizing plants affect the carbon cycle by…
a. Creating more carbon atoms
b. Reducing the amount of carbon in the soil, reducing soil fertility
c. Absorbing CO2 from the atmosphere, lowering atmospheric levels of carbon
d. None of the above; plants to do not affect the carbon cycle
Page | 1
Copyright 2011 by Craig Kohn, Agricultural Sciences, Waterford WI. This source may be freely used and distributed provided the author is cited.
9. Animals affect the carbon cycle by…
a. Creating more carbon atoms through cell division
b. Releasing CO2 into the atmosphere, increasing atmospheric levels of carbon
c. Consuming carbon, reducing the total amount of carbon that exists in the cycle
d. None of the above; animals do not affect the carbon cycle
**Use the image below to answer the questions below**
10. Look at “1”. What process is occurring here and only here?
a. Photosynthesis b. Respiration c. Decomposition
d. Burning
11. At “1”, what is occurring?
a. H2O and CO2 is being
converted into organic
C6H12O6.
b. C6H12O6 is being broken
down into H2O and
inorganic CO2
c. C6H12O6 remains in its
organic form
d. C6H12O6 is being created
from the energy of the
sun
12. Look at “2”. What process is
occurring here?
a. Photosynthesis
b. Respiration
c. Decomposition
d. Burning
13. At “2”, what is occurring?
a. H2O and CO2 is being converted into organic C6H12O6.
b. C6H12O6 is being broken down into H2O and inorganic CO2
c. C6H12O6 remains in its organic form
d. C6H12O6 is being created from the energy of the sun
14. What form of carbon are we most likely to find at “3”?
a. C6H12O6 b. CO2 c. CH4 d. Living Tissue
15. Look at “4”. What process is occurring here and only here?
a. Photosynthesis b. Burning c. Decomposition
Page | 2
Copyright 2011 by Craig Kohn, Agricultural Sciences, Waterford WI. This source may be freely used and distributed provided the author is cited.
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