Discussion
Azolla pinnata is a
Answer: D
Azolla pinnata is a fern.
Azolla is a small, free-floating aquatic fern that holds the nitrogen-fixing cyanobacterium Anabaena azollae in its leaves. It is therefore used as a bio-fertiliser in rice fields. The cyanobacterium inside it is the blue-green alga, not the plant itself, and the plant is neither a green nor a red alga.
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