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Which of the following is a symbiotic nitrogen fixer?

1. Azotobacter
2. Frankia
3. Azolla
4. Glycine

Correct answer: Azolla

Solution

Azolla is a symbiotic nitrogen fixer because it contains the cyanobacterium Anabaena in a mutualistic association, which fixes atmospheric nitrogen. Azotobacter is free-living, Frankia is symbiotic but not the given correct choice here, and Glycine is a plant genus, not a nitrogen-fixing symbiont.

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