A) VAM
B) Azotobacter
C) Anabaena
D) Rhizobium
Correct Answer: B
Solution :
Free-living (non-symbiotic) bacteria like Azotobacter and Bacillus polymyxa fix atmospheric nitrogen and make it available to crop plants. VAM (Vascular Arbuscular Mycorrhizae) is an endosymbiosis between fungi and roots of higher plants. Anabaena is a cyanobacterium (blue-green algae) which live solitary or in association with other plant and caniix atmospheric nitrogen. Rhizobium bacterium makes symbiotic association with leguminous plants.
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