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

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 A Symbiotic
The gaseous form of atmospheric nitrogen is converted to usable forms by various agencies of nitrogen fixation. Many bacteria and cyanobacteria fix atmospheric nitrogen in symbiotic association with other plants. In such relationship both get benefits from each other. Some examples are bacteria Rhizobium in association with roots of leguminous plants, Azolla in association with Anabaena. Hence, the correct answer is option A.

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