Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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Humans are affecting the carbon cycle by
a. | burning fossil fuels. | b. | destroying vegetation that absorbs carbon
dioxide. | c. | using electrical labor-saving devices. | d. | All of the
above |
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2.
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Which of the following is common to the carbon cycle, the nitrogen cycle,
and the water cycle?
a. | The substance is rearranged into different types of molecules as it moves through its
cycle. | b. | The substance must pass through organisms in order to complete its
cycle. | c. | The largest reserves of the substance are always in organisms. | d. | The substance is
required by all living things and is involved in many processes that occur in all living
things. |
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3.
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What cycle is the carbon cycle interconnected with?
a. | oxygen | c. | water | b. | nitrogen | d. | phosphorous |
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4.
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Carbon makes up approximately what percentage of the human body?
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5.
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Which of the following processes uses carbon?
a. | photosynthesis | c. | decay | b. | respiration | d. | combustion |
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6.
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Which of the following processes releases carbon to the atmosphere?
a. | respiration | c. | formation of carbonic acid in the oceans | b. | photosynthesis | d. | shell building in sea organisms |
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7.
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How does cutting down trees affect the carbon cycle?
a. | reduces the amout of carbon in the atmosphere | c. | does not affect the carbon cycle at
all | b. | reduces the number of plants available to remove carbon from the
atmosphere | d. | allows room for
more plants that are better at removing carbon from the atmosphere. |
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