Which of the following algae is symbiotic and nitrogen fixing?

Spirogyra

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Cladophora

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Anabaena

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Oedogonium

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Solution

The correct option is B Anabaena
Anabaena is an example of filamentous, multicellular cyanobacteria. Filaments of Anabaena are found living within ovoid cavities inside the leaves of the Azolla plant. Anabaena azollae maintains a mutually beneficial symbiotic relationship with the water fern Azolla and fixes atmospheric nitrogen with the help of the enzyme nitrogenase present in the heterocysts of the Anabaena.
Thus, the correct answer is option C.

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