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Question
Which one of the following is not a nitrogen-fixing organism?
Options
Anabaena
Nostoc
Azotobacter
Pseudomonas
Rhizobitim
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Solution
Pseudomonas
Explanation:
- Pseudomonas is a common soil bacterium but does not fix atmospheric nitrogen.
- Nostoc, Anabaena, and Rhizobium are nitrogen-fixing organisms that convert atmospheric nitrogen (N2) into usable forms for plants.
Hence, Pseudomonas is not a nitrogen-fixing organism.
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