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Which of the following statements is/are...

Which of the following statements is/are correct ?

A

In paddy fields, cyanobacteria serve as an important biofertiliser.

B

Vermicompost consists of organic metter 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

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The correct Answer is:
D
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