Soil bacteria are responsible for any steps in the nitrogen cycle. Soil bacteria are NOT responsible for A) assimilation. B) nitrification. C) ammonification. D) nitrogen fixation.

Soil bacteria are responsible for any steps in the nitrogen cycle. Soil bacteria are NOT responsible for assimilation.

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Answer: A. assimilation

Soil bacteria are responsible for nitrification, ammonification and nitrogen fixation but are not responsible for assimilation.

Assimilation is a process by which plants incorporate nitrate and ammonia produced by the nitrogen fixation and nitrification processes performed by the soil bacteria. Plants obtain these forms of nitrogen through roots, and utilize them for producing proteins and nucleic acids.