Which of the following is a non-symbiotic biofertilizer?

VAM

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Azotobacter

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Anabaena

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Rhizobium

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Solution

The correct option is B Azotobacter
Nitrogen is the important nutrient for plant growth. Plant obtains nitrogen from the atmosphere with the help of symbiotic and free nitrogen-fixing microorganisms. Azotobacter is aerobic free living nitrogen fixing organism and fixes atmospheric nitrogen non-symbiotically. Therefore, all plants, trees, vegetables get benefited. Whereas VAM, Anabaena and Rhizobium are the symbiotic organisms.
Thus, the correct answer is option B.

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