A) Tolypothrix
B) Chlorella
C) Nostoc
D) Anabaena
Correct Answer: D
Solution :
The freshwater fern Azolla harbours Anabaena (a blue green alga) in its leaf cavities. Chlorella is simply a green alga. Nostoc is a free living cyanobacteria involved in fixation and so is Tolypothrix. Hence, the correct option is [d].You need to login to perform this action.
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