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Q.
Which of the following is odd one out w.r.t. a free living $N2$ -fixing bacterium?
NTA AbhyasNTA Abhyas 2020
Solution:
Symbiotic bacteria are mainly gram-negative type and they are a subtype of heterotrophic bacteria. A familiar example of symbiotic bacteria is Rhizobium leguminosarum, associated with roots of leguminous plants. They are capable of fixing atmospheric nitrogen as ammonia, inside the nodule only and not in a free state. However, some bacteria like Azotobacter, Beijerinckia, Klebsiella are free-living, aerobic and capable of nitrogen fixation in a free state, enriching the soil. Clostridium pasteurianum is anaerobic nitrogen fixing bacteria.