Multiple choice

Which of the following bacteria is a free-living N2 fixer ?

  1. Anaplasma

  2. Actinomyces israelii

  3. Agrobacterium tumefaciens

  4. Azotobacter vinelandii

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

Azotobacter vinelandii is a free-living N2 fixer which is capable of producing numerous phytohormones and vitamins in the soil. It is diazotroph. It is used to study nitrogen fixation.