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Which one of the following is non-symbiotic biofertilizer?

1. Azotobacter
2. Anabaena
3. Rhizobium
4. VAM

Correct answer: Azotobacter

Solution

Azotobacter is a free-living, non-symbiotic nitrogen-fixing biofertilizer. Rhizobium is symbiotic with legume roots, Anabaena is often symbiotic in association with plants like Azolla, and VAM forms mycorrhizal symbiosis with roots.

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