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Unformatted text preview: it o Vascular: continuous (from roots to top of plant) Lignin : in plant cell walls, gives plant rigidity and strength, keeps xylem tubes open Stem: ground tissue in middle, vascular tissue on side Root: vascular tissues in middle Between Xylem (carrying water, cells dead at maturity) and Phloem (carrying sugars, alive at maturity) there is a layer of dividing cells that allows plant to grow Tracheid : specialized type of xylem, tubular Phloem : alive, sieve tube members and companion cell Sieve tube : each one has own companion cell, empty because packed to brim with sugar o Ground: workhorses Palisade mesophyll: do all the photosynthesis is ground tissue o Meristematic: undergoing cell division, its growing...
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- Winter '11