________ forms the symbiotic relationship with the mosquito fern, Azolla.
a) Anabaena b) Nostoc c) Azotobacter d) None of these
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a) Anabaena
Explanation:
Azolla and the blue-green alga Anabaena azollae maintain a symbiotic relationship: the alga provides nitrogen to the fern, and the fern provides a habitat for the alga.
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