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  4. Which one of the following is not a nitrogen fixing organism?

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Q. Which one of the following is not a nitrogen fixing organism?

NTA AbhyasNTA Abhyas 2020Mineral Nutrition

Solution:

Certain prokaryotic organisms are capable fixing nitrogen available in the air and reduce it to ammonia. They have presence of an enzyme called nitrogenase which helps in reduction of nitrogen to ammonia. This process is called biological nitrogen fixation and the organisms are called nitrogen fixers. These nitrogen fixers could be free living or symbiotic. The examples of these free living microbes are Azotobacter, Rhodospirillum, Anabaena, Nostoc, etc. Pseudomonas are not nitrogen fixing bacterias.