Question

Bio-fertilisers include:

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

Answer 1

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.