Advertisement Upgrade to remove ads  What is the main force by
which most of the water within xylem vessels moves toward the
top of a tree?  c. evaporation of water through stoma  In which
plant cell or tissue would the pressure component of water
potential most often be negative?  b. stem xylem  Water
potential is generally most negative in which of the following
parts of a plant?  a. mesophyll cells of the leaf  Which of the
following has the lowest (most negative) water potential?  e.
leaf air spaces  Which of the following is responsible for the
cohesion of water molecules?  c. hydrogen bonds between the
oxygen atom of one water molecule and a hydrogen atom of another
water molecule  Transpiration in plants requires all of the
following except  d. active transport through xylem cells.
Which of the following statements about transport in plants is
false?  e. Gymnosperms can sometimes develop especially high
root pressure, which may account for the rise of water in tall
pine trees without transpiration pul