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biology

Which of the following is non-symbiotic nitrogen fixer organism?

A

VAM

B

Azotobacter

C

Anabaena

D

Rhizobium

Answer

  • Azotobacter is a free-living obligate aerobic rod-shaped soil bacteria. It fixes the atmospheric nitrogen which is inaccessible to the plants into the soil. 
  • It does not reside in the roots of the plant. It remains in the soil and converts the atmospheric nitrogen into the soluble form, ammonium ions.
  • It has the unusual ability to fix atmospheric nitrogen as it produces nitrogenase enzyme and convert it to ammonia. 
Thus, the correct answer is option B.

Answered By

toppr

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