What is the relationship between water-fern (Azolla) and nitrogen-fixing cyanobacteria (Anabaena) called as?

Symbiotic

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Predation

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Parasitic

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Epiphytic

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Solution

The correct option is B Symbiotic
Water-fern (Azolla) form a symbiotic relationship with the cyanobacterium Anabaena azollae (microscopic filamentous blue-green alga), which fixes atmospheric nitrogen, giving the plant access to the essential nutrient. They grow together at the surface of quiet streams and ponds throughout tropical and temperate regions of the world.
Therefore, the correct answer is option A.

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