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Question

Rhizobium found in root nodules of leguminous plants plays the role of

A
Atmospheric carbon dioxide fixation
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B
Atmospheric oxygen fixaton
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C
Atmospheric nitrogen fixation
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D
All of the above
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Solution

The correct option is C Atmospheric nitrogen fixation
Rhizobium is a bacterium found in the root nodules of leguminous plants. It induces the formation of special structures called nodules inside which it fixes atmospheric nitrogen. It does this with the help of nitrogenase enzyme that converts of nitrogen to ammonium that is an important factor required for plant growth. In turn, the bacterium receives shelter from the plant. Thus the correct answer is option C.

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