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NEET Biology QUESTION #7269
Question 1
Nitrogen fixation in root nodules of Alnus is brought about by:
  • <em>Frankia</em>✔️
  • <em>Azorhizobium</em>
  • <em>Bradyrhizobium</em>
  • <em>Clostridium</em>
Correct Answer Explanation
Frankia is a filamentous actinomycete that forms nitrogen-fixing root nodules (actinorhizal nodules) in non-leguminous plants like Alnus (alder), Casuarina, and Ceanothus. Rhizobium and Bradyrhizobium nodulate legumes; Azorhizobium is stem-nodulating; Clostridium is a free-living anaerobic nitrogen fixer.