Concept
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Movement of Water and Minerals in the Xylem
Cohesion–Tension Theory of Sap Ascent
The cohesion–tension theory of sap ascent is shown. Evaporation from the mesophyll cells produces a negative water potential gradient that causes water to move upwards from the roots through the xylem.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Transport of Water and Solutes in Plants. October 17, 2013."
http://cnx.org/content/m44708/latest/Figure_30_05_04.png
OpenStax CNX
CC BY 3.0.