Multiple choice

Which of the following microorganisms can fix nitrogen?

  1. Cyanobacteria
  2. Green sulfur bacteria
  3. Azotobacteraceae
  4. Rhizobia
  5. Frankia

  1. 1 and 4

  2. 1, 3 and 4

  3. 1, 2, 3, 4 and 5

  4. 1, 2, 3 and 4
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nitrogen fixation is a process by which nitrogen (N2) in the atmosphere is converted into ammonia (NH3). Nitrogen fixation also refers to other biological conversions of nitrogen. Biological nitrogen fixation (BNF) occurs when atmospheric nitrogen is converted to ammonia by an enzyme called nitrogenase. All the given microorganisms can fix atmospheric nitrogen.

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