Question

Which of the following statements is/are incorrect?
(i) Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial habitats.
(ii) A nabaena, 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

• A. (v) Only
• B. (iv) Only
• C. (iii) Only
• D. None of these

Answer 1

Answer: (A)

In our country, a number of biofertilisers are available commercially in the market and farmers use these regularly in their fields. This helps to replenish soil nutrients and to reduce dependence on chemical fertilisers