The cohesion-tension mechanism of water movement occurs when __________.

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    the buildup of water pressure in the roots forces water up the stem through the xylem
    the transpiration of water from the leaf surface pulls water up the xylem as a result of hydrogen bonding between water molecules
    the stem contracts and decreases its diameter to force the water molecules through the tracheids and vessels
    the water is loaded into vessel elements by active transport at the source and unloaded at the sink to ensure a constant movement of water through the xylem

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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the transpiration of water from the leaf surface pulls water up the xylem as a result of hydrogen bonding between water molecules
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)



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