Which one of the following bacteria is not connected with nitrogen fixation?
Azotobacter
Nitrosomonas
Frankia
Rhizobium
A
Rhizobium
B
Azotobacter
C
Nitrosomonas
D
Frankia
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Solution
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Nitrogen fixation is referred to as conversion of atmospheric nitrogen into ammonia, whereas the Nitrosomonas is a genus of Gram-negative, chemoautotrophic bacteria. This organism oxidizes ammonia into nitrite as a metabolic process.
So, the correct option is 'Nitrosomonas'.
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