Which of the followig statements is/are incorrect ?
Channel: Doubtnut
Date: 23/08/2020

Which of the followig statements is/are incorrect ? (i) Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial habitats.   (ii) Anabaena, Nostoc and Oscillatoria are photosynthetic `N_(2)`-fixing cyanobacteria. (iii) Tolypothrix (BGA) can increase rice production by about `20%` (iv) BGA add organic matter to the soil and increase its fertility.  (v) In our country, biofertilisers are not available commercially in the markets for farmers.