Cyanobacteria as Biofertilisers — NEET Biology
📚 Practice ConceptCyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environments many of which can fix atmospheric nitrogen, e.g. Anabaena, Nostoc, Oscillatoria, etc. In paddy fields, cyanobacteria serve as an important biofertiliser. Blue green algae also add organic matter to the soil and increase its fertility. Currently, in our country, a number of biofertilisers are available commercially in the market and farmers use these regularly in their fields to replenish soil nutrients and to reduce dependence on chemical fertilisers.
Which statements about biofertilisers are correct? 1. Rhizobium fixes nitrogen in root nodules. 2. Azospirillum and Azotobacter fix nitrogen free-living in soil. 3. Glomus forms mycorrhiza and improves tolerance to salinity. 4. Cyanobacteria like Anabaena enrich paddy fields. 5. Biofertilisers reduce nutrient quality of soil.
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