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Mineral Nutrition

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Biological Classification
  1. A free living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is
    1. Tolypothrix
    2. Chlorella
    3. Nostoc
    4. Anabaena
Correct Option: D

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 N2 fixation and so is Tolypothrix.


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