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Question

The bacteria which is associated with some plant roots and fix atmospheric nitrogen is called

A
Azotobacter
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B
Escherichia
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C
Rhizobium
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D
Pseudomonas
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Solution

The correct option is C Rhizobium
Rhizobium is a genus of Gram-negative soil bacteria, that can fix atmospheric nitrogen. Rhizobium forms an endosymbiotic nitrogen- fixing association with roots of legumes. The bacteria colonize plant cells within root nodules, where the bacteria convert atmospheric nitrogen to ammonia.
So, the correct answer is 'Rhizobium'

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