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Question

Bio-fertilisers include:

A
Urea
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B
Only Cyanobacteria
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C
Gut bacteria
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D
Nitrogen fixing bacteria, Cyanobacteria and Fungi
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Solution

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

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