Cyanobacteria helps farmers by
(a) reducing the alkalinity of the soil
(b) reducing the acidity of the soil
(c) neutralising the alkalinity of the soil
(d) water logging.
Correct option (b) reducing the acidity of the soil
Explanation :
Cyanobacteria fix atmospheric nitrogen to nitrogen oxides (nitrate and nitrites). These oxides reduce the acidity of soil.
