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Which of the following is a symbiotic nitrogen fixer?

  1. A
    Azotobacter
  2. B
    Frankia
  3. C
    Azolla
  4. D
    Glomus

Solution & Step-by-step Explanation

Frankia is a genus of actinomycetes that forms symbiotic nitrogen-fixing nodules on the roots of non-leguminous plants like Alnus. Azotobacter is a free-living nitrogen fixer.

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Which of the following is a symbiotic nitrogen fixer?
A
Azotobacter
B
Frankia
C
Azolla
D
Glomus

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