A) a cyanobacteria like Anabaena species living in cavities of Azolla leaves
B) symbiotic association like Azotobacter which fixed atmospheric nitrogen
C) farm yard manure consisting of mixture of cattle dung and crop
D) green manure in which a quickly growing crop is cultivated and ploughed under
Correct Answer: A
Solution :
Biofertiliser are those organism which fix atmospheric nitrogen through biological processes. Generally, cyanobacteria/Vostoc, and Anabaena species are used in agricultural field to increase the rice yield by more than 50%.
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