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 (10[1])growth according to the starch-statolith hypothesis. (10[1])These structures can recover from damage by triggering the proliferation of stem cells (-5[1])located in quiescent centers. The lengthening of cells in the zone of elongation (-5[1])causes most of the growth (10[1])of these structures, which often display positive (10[1])gravitropism. (10[1]-5[2])These structures form symbiotic relationships with fungi called mycorrhizae. Material in these structures is transported to the rest of the organism (10[1])through the xylem. For 10 points, name these structures (10[1])that plants use to take up nutrients and water. (10[1])■END■ (10[2])