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Question

Bio-fertilizers include:

A
Nitrogen fixing bacteria
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B
Nitrogen fixing cyanobacteria
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C
Both bacteria and cyanobacteria
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D
Bacteria, cyanobacteria and mycorrhizal fungi
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Solution

The correct option is D Bacteria, cyanobacteria and mycorrhizal fungi
Bio-fertilizers are microorganisms which bring about the nutrient enrichment of soil by enhancing the availability of nutrients to crops. The microorganisms which act as bio-fertilizers are bacteria, cyanobacteria (blue-green algae) and mycorrhizal fungi. Bacteria and cyanobacteria have the property of nitrogen fixation while mycorrhizal fungi preferentially withdraw min­erals from organic matter for the plant with which they are associated.

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