Q.3
Which of the following is not a diazatroph?
- Diazotroph Definition: Organisms possessing the nif gene cluster capable of reducing atmospheric dinitrogen ($\text{N}_2$) into ammonia ($\text{NH}_3$).
- Escherichia coli is Non-Diazotrophic: Escherichia species naturally lack the nitrogenase enzyme complex and nif operon, and are entirely incapable of biological nitrogen fixation.
- Diazotrophic Genera: Many strains of Pseudomonas (e.g., P. stutzeri), Azotobacter, and related soil proteobacteria harbor functional nif genes and carry out nitrogen fixation.
Correct option: (4) Escherichia
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