Microbes in Hum...

Which of the following 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, fertilizers are not available commercially in the markets for farmers.

Which of the following is a non-symbiotic biofertilizer?

Azolla gives a good biofertilizer when mixed with

Which one is true?

Microorganism used for commercial production of acetic acid is

Large holes in Swiss cheese are formed due to production of a large amount of ${CO}_{2}$ by ?

Select the correct statement from the following 

The organism which is used commercially for the production of statins is

Curd is rich in?

Waste water treatment generates a large amount of sludge, which can be treated by