(D) In $Cycas$,coralloid roots are bluish-green in color and contain blue-green algae (cyanobacteria like $Anabaena$ or $Nostoc$) within their cortica

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(D) In $Cycas$,coralloid roots are bluish-green in color and contain blue-green algae (cyanobacteria like $Anabaena$ or $Nostoc$) within their cortical region.This specific feature,known as the algal zone,is unique to the coralloid roots of $Cycas$ and is absent in the roots of angiosperms.