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Plant water transport, artwork
Plant water transport. Artwork of water molecules (blue) entering a tree through osmosis in the roots, passing upwards through the xylem vessels in the trunk and branches, and exiting through the stomata in the leaves (transpiration). This is shown in more detail in the inset artworks at right. The upwards movement of the water, against gravity, is shown by the red arrows. This transpiration stream is a combination of osmotic root pressure, capillary action, and evaporation. The circular inset (centre right) shows hydrogen bonding (dotted lines) between water molecules that form linked strands within the xylem.
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