Question
Biology Question on Nutrition
Which of the following is/are free living nitrogen fixers?
A
Azotobacter, Beijerinckia
B
Glomus
C
Frankia
D
Rhizobium
Answer
Azotobacter, Beijerinckia
Explanation
Solution
Azotobacter and Beijerinckia are free living nitrogen fixing bacteria. Frankia and Rhizobium are free living aerobes in soil but are unable to fix nitrogen in that state and can fix nitrogen only in symbiotic association. Glomus is an arbuscular mycorrhizal fungi fixing nitrogen in symbiotic association.