객관식
Which of the following does NOT conduct nitrogen fixation?
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35. Soil
Nitrogen Fixation
객관식
In the context of nitrogen fixation, where is the majority of nitrogen stored in the Earth's ecosystem?
A
In living organisms as proteins
B
In ocean water as nitrate (NO\(_3^-\))
C
In the soil as ammonium (NH\(_4^+\))
D
In the atmosphere as N\(_2\) gas
검증된 단계별 안내1
Understand the concept of nitrogen fixation: Nitrogen fixation is the process by which nitrogen gas (N\(_2\)) from the atmosphere is converted into forms usable by living organisms, such as ammonium (NH\(_4^+\)) or nitrate (NO\(_3^-\)). This process is essential for the nitrogen cycle.
Recognize the major storage location of nitrogen: The Earth's atmosphere contains approximately 78% nitrogen gas (N\(_2\)), making it the largest reservoir of nitrogen in the ecosystem. This nitrogen is largely inert and unavailable to most organisms without nitrogen fixation.
Compare the other options: Nitrogen in living organisms as proteins, in ocean water as nitrate (NO\(_3^-\)), and in soil as ammonium (NH\(_4^+\)) are smaller reservoirs compared to the atmospheric nitrogen gas (N\(_2\)). These forms are products of nitrogen fixation and subsequent processes in the nitrogen cycle.
Understand why N\(_2\) gas is the correct answer: The majority of nitrogen is stored in the atmosphere as N\(_2\) gas because it is chemically stable and abundant. Other forms of nitrogen are derived from this atmospheric reservoir through biological or chemical processes.
Conclude the reasoning: The correct answer is 'In the atmosphere as N\(_2\) gas' because it represents the largest and most stable reservoir of nitrogen in the Earth's ecosystem.
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