Question

carbon and nitrogen cycles
nitrogen gas
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denitrifying bacteria
multiple - choice question
what organism converts nitrogen in the soil back into nitrogen gas?
earthworms
bacteria
plant roots

Explanation:

Denitrifying bacteria are known to convert nitrogen compounds in the soil (such as nitrates) back into nitrogen gas (\(N_2\)) through the process of denitrification. Earthworms mainly help in soil aeration and decomposition of organic matter. Plant roots absorb nitrogen in the form of nitrates or ammonium ions for plant growth, not convert it to nitrogen gas.

Answer:

bacteria