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Question

Rhizobium bacteria is associated with the fixation of

A
Oxygen
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B
Carbon dioxide
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C
Nitrogen
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D
Water vapour
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Solution

The correct option is B Nitrogen
Rhizobium bacteria is symbiotically associated with roots of leguminous plants and has the capacity to fix atmospheric Nitrogen into absorbable forms like nitrates, nitrites etc. This process is essential as plants cannot directly absorb and utilize atmospheric Nitrogen.
So, the correct answer is 'Nitrogen'

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