Multiple choice

An example of free living nitrogen fixing aerobic bacteria is

  1. clostridium

  2. rhizobium

  3. azotobacter

  4. rhodospirillum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Azotobacter is a free-living, aerobic, nitrogen-fixing bacteria found in soil. Unlike Rhizobium which forms symbiotic associations with legume roots, or Clostridium which is anaerobic, Azotobacter lives independently and fixes atmospheric nitrogen aerobically. Rhodospirillum is a photosynthetic bacteria, not primarily known for free nitrogen fixation.

Keep practicing — related questions