Question

Are Rhizobium genera the only nitrogen-fixing bacteria?

Answer 1

Nitrogen-fixing bacteria:

1. Nitrogen can occur in both organic and inorganic forms.
2. These forms change from one form to another.
3. The conversion of molecular nitrogen to ammonia is called biological nitrogen fixation.
4. Biological nitrogen fixation is carried out by nitrogen-fixing organisms.
5. The nitrogen-fixing organisms are all prokaryotes.
6. Examples of nitrogen-fixing bacteria include Nostoc, Anabaena, Pseudomonas, Azotobacter, Thiobacillus, Methanococcus, Chromatium, Chlorobium, Desulfovibrio, Clostridium, and Frankia.