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| Description: 1 Water evaporates from aboveground plant parts (a process called transpiration), mainly through open stomata. 2 The evaporation exerts tension (pulls) on the narrow columns of water that fill xylem tubes. The tension extends from leaves to roots because liquid water has cohesion. Hydrogen bonds among water molecules collectively impart cohesion to liquid water. 3 As long as evaporation continues, the tension it creates drives the uptake of more water molecules from soil. Picture Stats: Views: 831 Filesize: 232.05kB Height: 1037 Width: 491 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47884 |