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A nitrogen-fixing microbe associated with Azolla in rice fields is:

1. Spirulina
2. Anabaena
3. Frankia
4. Tolypothrix

Correct answer: Anabaena

Solution

Azolla hosts a nitrogen-fixing cyanobacterium in specialized leaf cavities, and that symbiont is Anabaena. This association helps add biologically fixed nitrogen to paddy fields.

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