Question

Which of the following is a symbiotic nitrogen fixer?

• A. Nostoc
• B. Glomus
• C. Azotobacter
• D. Frankia

Answer 1

The correct option is D Frankia

Symbiotic nitrogen fixation is a process found in plants that harbor nitrogen-fixing bacteria within their tissues. Microorganisms, that can fix nitrogen include a diverse group of prokaryotes, cyanobacteria and diazotrophs, such as Azotobacteraceae, Rhizobia and Frankia. While the leguminous plants have the symbiotic association with Rhizobium for the fixation of nitrogen, Frankia is used by the non-leguminous plants in their symbiotic association.

So, the correct answer is 'Frankia'.