Which of the following is an example of a bio | vedclass

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(D) Biofertilizers are organisms that enrich the nutrient quality of the soil. $1$. $Azolla-Anabaena$ symbiosis involves the cyanobacterium $Anabaena$

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All of the above

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(D) Biofertilizers are organisms that enrich the nutrient quality of the soil. $1$. $Azolla-Anabaena$ symbiosis involves the cyanobacterium $Anabaena$ living in the leaves of the fern $Azolla$,fixing atmospheric nitrogen. $2$. $Mycorrhiza$ is a symbiotic association between fungi and roots of higher plants,which helps in phosphorus absorption. $3$. $Legume-Rhizobium$ symbiosis involves the bacteria $Rhizobium$ forming nodules in the roots of leguminous plants to fix nitrogen. Since all these are examples of biofertilizers,the correct option is $D$.

Which of the following is an example of a biofertilizer?

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