Their three common divisions are tap, fibrous, and adventitious.
The outside of these structures is covered by mucigel. These structures are normally divided into zones of maturation, elongation, and division, as well as a "cap". These structures contain a quiescent center of low mitotic activity surrounded by an apical meristem that produces cells in two directions. Their embryonic form is the radicle. A diffusion barrier in them is the Casparian strip. Their three common divisions are tap, fibrous, and adventitious. If the level of cytokinin is less than the level of auxin, these structures are formed. Fungi form symbiotic relationships with these structures in mycorrhizae, and rhizobia, which fix nitrogen, form nodules on them. For 10 points, name these plant parts that grow underground.
The outside of these structures is covered by mucigel. These structures are normally divided into zones of maturation, elongation, and division, as well as a "cap".
roots [or root apical meristem; or RAM]