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Microbes In Human Welfare

Question
CBSEENBI12002361
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A nitrogen-fixing microbe associated with Azolla in rice field is

  • Spirulina

  • Anabaena

  • Frankia

  • Tolypothrix

Solution

B.

Anabaena

Anabaena azollae is a free-living nitrogen fixing blue-green alga or cyanobacterium but it may also live symbiotically in the leaf cavities of Azolla, an aquatic, fee floating, fresh water pteridophyte (fern). This cyanobacterium has nitrogenase enzyme, therefore can fix nitrogen, If this fern is grown in paddy (rice) fields, a remarkable 50% increase in yield can be noticed.

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