Matter is constantly cycled between living and nonliving parts of the environment. Processes like photosynthesis and respiration allow the carbon cycle to regenerate needed substances by recycling Earth’s atoms. A diagram of the carbon cycle is shown. Which explanation best describes the process that occurs at the arrow marked B?
A. Plants use carbon dioxide from the atmosphere in the process of photosynthesis to produce glucose.
B. Plants release carbon dioxide into the atmosphere in the process of photosynthesis to produce glucose.
C. Plants use carbon dioxide from the atmosphere in the process of cellular respiration to convert glucose to ATP energy.
D. Plants release carbon dioxide into the atmosphere in the process of cellular respiration to convert glucose to ATP energy.
Deforestation has a crucial impact on the amount of carbon dioxide in the atmosphere. Which explanation best describes what is happening at the arrow marked A?
A. When forests are cut down, carbon absorption slows or ceases due to less photosynthesis occurring.
B. When forests are cut down, carbon absorption slows or ceases due to less respiration occurring in plants.
C. Trees cut down in deforestation are burned or left to rot causing additional carbon dioxide to be absorbed by the atmosphere.
For the first question regarding the process at arrow marked B, the correct answer is:
D. Plants release carbon dioxide into the atmosphere in the process of cellular respiration to convert glucose to ATP energy.
Explanation: During cellular respiration, plants convert glucose into energy (ATP), and this process releases carbon dioxide as a byproduct.
For the second question about the impact of deforestation at arrow marked A, the correct answer is:
A. When forests are cut down, carbon absorption slows or ceases due to less photosynthesis occurring.
Explanation: Trees absorb carbon dioxide during photosynthesis. When they are cut down, there are fewer trees to take in carbon dioxide, leading to increased levels of carbon dioxide in the atmosphere.
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