(B) Cyanobacteria,specifically $Anabaena$ and $Nostoc$,form a symbiotic association with the coralloid roots of $Cycas$.These cyanobacteria fix atmosp

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(B) Cyanobacteria,specifically $Anabaena$ and $Nostoc$,form a symbiotic association with the coralloid roots of $Cycas$.These cyanobacteria fix atmospheric nitrogen,which is beneficial for the plant.Therefore,in paddy fields or other environments,cyanobacteria are commonly found associated with the coralloid roots of $Cycas$.