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Q.
Which one of the following is not a nitrogen-fixing organism?
Microbes in Human Welfare
Solution:
Pseudomonas is not a nitrogen-fixing bacteria, Pseudomonas is a saprophytic bacteria. Pseudomonas are used for biodegradation of organic pollutant like petroleum spillage. Azotobacter is a free living nitrogen fixing bacteria. Anabaena and Nostoc are free living nitrogen fixing cyanobacteria.