Multiple Choice
In the overall equation for photosynthesis, where does oxygen ($\mathrm{O_2}$) appear?
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9. Photosynthesis
Introduction to Photosynthesis
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In the context of geochemical cycles, what primary role does a maple tree play?
A
It acts as a producer, converting atmospheric CO$_2$ into organic molecules through photosynthesis.
B
It serves as a primary decomposer, breaking down dead organic matter.
C
It releases nitrogen gas directly into the atmosphere during respiration.
D
It fixes atmospheric nitrogen into ammonia in its roots.
Verified step by step guidance1
Understand the role of a maple tree in the ecosystem. Maple trees are plants, and plants are classified as producers in ecological systems.
Recall the process of photosynthesis, where plants convert atmospheric CO$_2$ into organic molecules (like glucose) using sunlight, water, and chlorophyll. This is a defining characteristic of producers.
Eliminate the incorrect options: Maple trees do not act as decomposers because they do not break down dead organic matter. Decomposers are typically fungi or bacteria.
Consider the nitrogen-related options: Maple trees do not release nitrogen gas during respiration, nor do they fix atmospheric nitrogen into ammonia in their roots. Nitrogen fixation is typically performed by certain bacteria, not plants like maple trees.
Conclude that the primary role of a maple tree in geochemical cycles is as a producer, converting atmospheric CO$_2$ into organic molecules through photosynthesis.
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