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Which of the following is a non-symbioti...

Which of the following is a non-symbiotic biofertiliser ?

A

VAM

B

Azotobacter

C

Anabaena

D

Rhizobium

Text Solution

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The correct Answer is:
B
Free-living (non-symbiotic ) bacteria like Azotobacter and Bacillus polymyxa fix atmospheric nitrogen and make it available to crop plants. VAM (Vasicular 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 can fix atmospheric `N_(2)`.
Rhizobium bacterium makes symbiotic association with leguminous plants.
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