Question

carbon cycle
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. each arrow represents a process in the cycle. 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

Explanation:

To determine the process at arrow B, we analyze the carbon cycle and the options:

• Photosynthesis (option A and B) involves plants taking in \(CO_2\), not releasing it, so B is incorrect.
• Option C says plants use \(CO_2\) for cellular respiration, but cellular respiration uses glucose and releases \(CO_2\), so C is incorrect.
• Option D: Cellular respiration in plants releases \(CO_2\) (as seen in the carbon cycle arrow from plants to atmosphere) and converts glucose to ATP energy, matching the process at B.

Answer:

D. Plants release carbon dioxide into the atmosphere in the process of cellular respiration to convert glucose to ATP energy.