A) Mycorrhiza
B) Azolla pinnata
C) Cyanobacteria
D) Legume-Rhizobium symbiosis
Correct Answer: B
Solution :
Anabaena azollae, a cyanobacterium living in the cavities of fern Azolla pimata fixes atmospheric nitrogen and releases it into the leaf cavity of the fem. Farmers have reported over 50% higher yields by using Azolla.
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