the transpiration stream

• what is the defintion of tranpiration

  the evaporation of water from inside the leaves though the stomata and into the atmopsphere
• what is the first step of transpiration


  water is absorbed by the root hair cells
• what happens after water is absorbed by the roots

  the water moves through the root tissue ,into the xylem in the stem
• what happens in transpiration afte the water is in the xylem


  the water moves to teh surface of the leaf and evaporates
• what is the defintion of cohesion


  water molecules are attracted to each other by hydrogen bonds
• what is the definition of adhesion


  water molecules are attracted to the hydrophilic lining of the lignified xylem vessel walls
• what does cohesion use to move water


  the hydrogen bonds between water molecules
• what does adhaesion use to move the water


  the hydrophilic lininf of the cell wall
• what is the cohesion tension theory


  The model of water moving from the soil to the leaf in a continuous stream
• what two other processes help water move up the xylem


  capillarity and root pressure
• what is meant by capillarity


  the forces of adhesion and cohesion that allows water molecules to move a short distance
• why is capillarity not usful in trees


  the action is apposed by gravity
• what is the defintion of root pressure


  this is when water moves from the endodermal cells of the root and into the xylem by osmosis
• what does root pressure generatie in teh xylem


  hydrostatic pressure that forces the water up a small distance
• what is the definition of adhesion`