Plant biology.      Xylem may direct water where it's needed.
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D020100:Hydrogels; D006863:Hydrogen-Ion Concentration; D007477:Ions; D008566:Membranes / Q000502:physiology; D010368:Pectins / Q000378:metabolism*; D018521:Plant Physiological Phenomena; D018547:Plant Stems / Q000502:physiology; D018514:Plant Structures / Q000502:physiology*; D014867:Water
D020100:Hydrogels; D007477:Ions; D014867:Water; D010368:Pectins