Multiple Choice
Local conditions such as heavy rainfall or the removal of plants may limit the amount of nitrogen, phosphorus, or calcium available to a particular ecosystem, but the amount of carbon available to the system is seldom a problem. Why?
52. Ecosystems
Introduction to Ecosystems
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The direct product of nitrogen fixation is __________.
A
NH4+
B
NO2–
C
NO3–
D
N2
E
NH3
Verified step by step guidance1
Understand the process of nitrogen fixation: Nitrogen fixation is the conversion of atmospheric nitrogen (N2) into a form that can be used by living organisms. This process is primarily carried out by certain bacteria and archaea, often in symbiosis with plants.
Identify the main product of nitrogen fixation: The direct product of nitrogen fixation is ammonia (NH3). This is because the nitrogenase enzyme complex in these microorganisms converts N2 into NH3.
Recognize the role of ammonia in the nitrogen cycle: Once ammonia is produced, it can be further processed into other nitrogenous compounds like ammonium (NH4+), nitrite (NO2–), and nitrate (NO3–) through various biological processes such as nitrification.
Differentiate between the direct product and subsequent products: While NH3 is the direct product of nitrogen fixation, NH4+, NO2–, and NO3– are products of subsequent processes in the nitrogen cycle.
Conclude with the correct identification: Based on the understanding of nitrogen fixation, the direct product is NH3, which is then utilized or transformed in the ecosystem.
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