Multiple Choice
Why can't plants and animals use nitrogen (N_2) directly as it is found in the atmosphere?
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Nitrogen Fixation
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Denitrification is an essential step in which of the following cycles?
A
Sulfur cycle
B
Phosphorus cycle
C
Carbon cycle
D
Nitrogen cycle
Verified step by step guidance1
Understand the concept of denitrification: Denitrification is a microbial process where nitrate (NO₃⁻) is reduced to nitrogen gas (N₂) or other nitrogenous compounds, releasing nitrogen back into the atmosphere.
Identify the cycle associated with nitrogen transformations: Denitrification is a key step in the nitrogen cycle, which involves the movement of nitrogen through the atmosphere, biosphere, and geosphere.
Compare the cycles listed in the problem: The sulfur cycle deals with sulfur compounds, the phosphorus cycle involves phosphorus movement, and the carbon cycle focuses on carbon transformations. None of these cycles involve nitrate reduction.
Relate denitrification to the nitrogen cycle: Denitrification is specifically part of the nitrogen cycle because it involves nitrogen compounds and their conversion into atmospheric nitrogen.
Conclude that the nitrogen cycle is the correct answer: Based on the process of denitrification and its role in recycling nitrogen, the nitrogen cycle is the essential cycle associated with this process.
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