(A) Gymnosperms are characterized by the presence of a tap root system. In some genera,like $Pinus$,the roots have a fungal association in the form of

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(A) Gymnosperms are characterized by the presence of a tap root system. In some genera,like $Pinus$,the roots have a fungal association in the form of mycorrhiza,while in $Cycas$,specialized roots called coralloid roots are associated with $N_2$-fixing cyanobacteria.