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The common nitrogen fixer in paddy fields is

1. Rhizobium
2. Azospirillum
3. Oscillatoria
4. Frankia

Correct answer: Azospirillum

Solution

Azospirillum is a well-known associative nitrogen fixer found around the roots of grasses, including rice in paddy fields. Rhizobium fixes nitrogen in legume nodules, Frankia in actinorhizal plants, and Oscillatoria is not the common paddy-field nitrogen fixer here.

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