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Question
Which one of the following is not a nitrogen fixing organism?
Which one of the following is not a nitrogen fixing organism?
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Solution
The correct option is D Thiobacillus
Thiobacillus is a denitrifying bacteria, which converts nitrates into free nitrogen, i.e., these denitrifying bacteria are responsible to liberate free nitrogen in the environment.
Other options (a), (b) and (c) are nitrogen fixing microorganisms.
Azotobacter is free-living bacteria, which absorb free nitrogen from soil, air and convert it into ammonia and other nitrogenous compounds.
Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environments, many of which can fix atmospheric nitrogen, e.g., Nostoc, Anabaena.
Thiobacillus is a denitrifying bacteria, which converts nitrates into free nitrogen, i.e., these denitrifying bacteria are responsible to liberate free nitrogen in the environment.
Other options (a), (b) and (c) are nitrogen fixing microorganisms.
Azotobacter is free-living bacteria, which absorb free nitrogen from soil, air and convert it into ammonia and other nitrogenous compounds.
Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environments, many of which can fix atmospheric nitrogen, e.g., Nostoc, Anabaena.
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