Azotobacter species fix atmospheric nitrogen within soils via:__________?
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Answer: B. Non-symbiotically
Explanation
Azotobacter species function as free living soil bacteria that fix atmospheric nitrogen non symbiotically. These diazotrophic microbes do not require a host plant root system to fix atmospheric nitrogen gas. Biochemical nitrogenase enzymes within Azotobacter cells convert inert nitrogen into bioavailable ammonia. Biological nitrogen conversion is essential for enriching soil fertility naturally without synthetic fertilizers. Free living soil bacteria obtain energy from decomposing organic matter while fixing ambient nitrogen. Soil microbiology studies beneficial microbial populations that support sustainable agricultural practices.
Biofertilizers containing Azotobacter are applied to farm soils to enhance crop nutrient uptake and growth. Sustainable farming systems leverage non symbiotic nitrogen fixers to reduce chemical fertilizer dependence. Soil health management depends on maintaining active microbial communities for natural nutrient cycling. Symbiotic nitrogen fixation requires specialized plant partners such as legumes rather than free living bacteria. Selecting both options is incorrect because Azotobacter operates exclusively through non symbiotic pathways. None of these is wrong since the correct non symbiotic classification is explicitly provided.
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- Agriculture
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- Agriculture
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