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  4. Which of the following is a nitrogen fixing organism?

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Q. Which of the following is a nitrogen fixing organism?

Delhi UMET/DPMTDelhi UMET/DPMT 2005

Solution:

Anabaena, Nostoc, Aulosira and Tolypothrix are free living nitrogen- fixing cyanobacteria whereas Rhizobium sp., Frankia, etc., are symbiotic nitrogen fixing bacteria and Azotobacter (aerobic), Clostridium (anaerobic), Beijerinckia (aerobic), Rhodospirillum, Chromatium, Rhodopseudomonas are free living nitrogen fixing bacteria. Aspergillus niger causes Aspergillosis and produce citric acid, oxalic acid etc.