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Biological Classification question

2004 · Q23
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Biological Classification question

2004 · Q23

NEETBiologyBiological ClassificationMCQ+4 / −1
A free living nitrogen-fixing cyanobacterium which can also symbiotic association with the water ferm Azolla is
  1. A
    Tolypothrix
  2. B
    Chlorella
  3. C
    Nostoc
  4. D
    Anabaena.
View written solutionFree

Correct answer: 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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