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.

Options

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

Answer

A

Explanation

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