These structures release cells that perform neutrophil-like functions by expelling extracellular DNA, called border cells. The movement of specialized organelles within the columella cells of these structures helps direct their growth according to the starch-statolith hypothesis. These structures can recover from damage by triggering the proliferation of stem cells located in quiescent centers. (10[1])The lengthening of cells in the zone of elongation causes most of the growth of these structures, (-5[1])which often (-5[1])display positive gravitropism. (-5[1])These structures form symbiotic (10[1])relationships with fungi called (10[1])mycorrhizae. (10[1])Material in these structures is transported to the rest of the organism through the xylem. (10[1])For 10 points, name these structures that plants use to take up nutrients (10[1])and water. ■END■ (10[1])