Multiple Choice
Which of the following processes is primarily responsible for returning nitrogen from dead organisms back into the atmosphere in the nitrogen cycle?
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52. Ecosystems
Biogeochemical Cycles
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In the coupled processes of photosynthesis and cellular respiration, which substances are primarily recycled between these two pathways in ecosystems?
A
Phosphate and nitrate
B
Carbon dioxide and oxygen
C
Nitrogen gas and ammonia
D
Glucose and ATP
Verified step by step guidance1
Understand that photosynthesis and cellular respiration are complementary biological processes that cycle certain substances in ecosystems.
Recall that photosynthesis uses carbon dioxide (CO\_2) and water to produce glucose and oxygen (O\_2) using light energy.
Recognize that cellular respiration uses glucose and oxygen to produce carbon dioxide, water, and ATP (energy).
Identify that the substances primarily recycled between these two pathways are carbon dioxide and oxygen, as photosynthesis consumes CO\_2 and releases O\_2, while respiration consumes O\_2 and releases CO\_2.
Note that other substances like phosphate, nitrate, nitrogen gas, ammonia, glucose, and ATP are involved in different biological cycles or processes but are not the main recycled substances between photosynthesis and cellular respiration.
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