A) cow dung manure and farmyard waste
B) quick growing crop ploughed under soil
C) Anabaena and Azolla
D) none of these
Correct Answer: C
Solution :
Biofertilisers are the organisms which bring about nutrient available to cror plants either directly or through enrichment of soil, e.g., Anabciena, Azolla, Rhizobium, AzospiriUum, etc.
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