Regarding Cyanobacteria as Biofertilisers, which statements are true?
a. Cyanobacteria are heterotrophic microbes widely distributed in aquatic environments.
b. Many Cyanobacteria (e.g., Anabaena, Nostoc) can fix atmospheric nitrogen.
c. They serve as an important biofertiliser in non-aquatic farming environments.
d. Blue green algae add organic matter to the soil, which helps increase its fertility.
e. Farmers are currently encouraged to switch to chemical fertilisers to improve yield.
