Which of the following is 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 A Azotobacter
VAM, Anabaena and Rhizobium are all symbionts associated with roots of vascular plants, Azolla and leguminous plants respectively. Only Azotobacter is a non-symbiotic bacteria are also called free-living nitrogen-fixing bacteria. It is mainly used for monocot vegetables and increases crop production in large scale. Thus, the correct answer is option B.

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