Multiple choice

Which one of the following is a non-symbiotic biofertilizer?

  1. VAM

  2. Azotobacter

  3. Anabaena

  4. Rhizobium

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Azotobacter is a free-living, non-symbiotic nitrogen-fixing bacterium, whereas Rhizobium, VAM, and Anabaena are typically associated with symbiotic relationships.