NEET 2012 Biology question
A nitrogen-fixing microbe associated with Azolla in rice fields is
Answer: (3)
Solution
Azolla is a water fern with a symbiotic nitrogen-fixing cyanobacterium, Anabaena azollae, living in its leaf cavities. Azolla is used as a biofertiliser in paddy fields. Tolypothrix is a free-living
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