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A biofertiliser is :...

A biofertiliser is :

A

a cyanobacterium like Anabaena species living in cavities of Azolla leaves.

B

symbiotic association like Azotobacter which fixes atmospheric nitrogen

C

green manure in which a quickly growing crop is cultivated and ploughed under.

D

green manure in which a quickly growing crop is cultivated and ploughed under.

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The correct Answer is:
A
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