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  1. Nitrogen fixation in root nodules of Alnus is brought about by :

    1. Bradyrhizobium
    2. Clostridium
    3. Frankia
    4. Azorhizobium
Correct Option: C

Nitrogen fixation in root nodules of Alnus is brought about by Frankia. It is a symbiotic nitrogen fixing bacteria in root nodules of several non-legume plants like Casuarina (Australian Pine), Myrica and Alnus (Alder).



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