Which of the following statements is/are correct ?

Options

A. In paddy fields, cyanobacteria serve as an important biofertiliser.
B. Vermicompost consists of organic matter prepared by the action of earthworms on human or animal waste.
C. The important examples of cyanobacteria as biofertilisers are Anabaena, Nostoc and Oscillatoria.
D. All of these

Answer

D