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

1. Bradyrhizobium
2. Clostridium
3. Frankia
4. Azorhizobium

Correct answer: Frankia

Solution

Alnus (alder) forms actinorhizal root nodules, which are colonized by the filamentous nitrogen-fixing bacterium Frankia. This symbiosis enables atmospheric nitrogen fixation in the nodules.

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