Azolla has a symbiotic relationship with

Chlorella

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Anabaena

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Nostoc

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Tolypothrix

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Solution

The correct option is C Anabaena
Atmospheric nitrogen is not available to plants. Nitrogen fixing bacteria converts atmospheric nitrogen into ammonium compounds and make it available for plants. Azolla is an aquatic fern. It is in symbiotic association with Anabaena, cyanobacteria.It is used as biofertilizer in the yield of rice by increasing the amount of nitrogenous compound in the soil.
Thus, the correct answer is 'Anabaena.'

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Explain the difference between symbiotic relationship and non symbiotic relationship

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