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Chapter 31-32 Nutrition and Transport in a Flowering Plant

  1. What is the theory that 2 Irish scientists proposed about water transport in a plant?
    Water Transport Theory- Cohesion-tension model of water transport
  2. What are the names of the 2 Irish scientists that proposed the Water Transport Theory- Cohesion-tension model of water transport?
    • John Joly
    • Henry Dixon
  3. What are the 6 simplified steps in the water transport theory- Cohesion-tension model of water transport?
    • Osmosis
    • Root pressure
    • Cohesion
    • Adhesion
    • Transpiration
    • Tension
  4. Write explanation of the water transport theory- cohesion-tension model of water transport? (9p).
    • John Joly and Henry Dixon are Irish scientists who first proposed the cohesion-tension model of water transport.
    • Root pressure- built up pressure caused by water moving into the xylem tissue of the root.
    • Root pressure contributes to the upward movement of water molecules.
    • Cohesion of water molecules- water molecules have hydrogen bonds between them maintaining them in liquid form.
    • Adhesion of water molecules- water molecules also tend to stick easily to the sides of the xylem vessels.
    • (Pull from above) Transpiration- of water molecules occurs mainly in the leaves. This pulls the column of water molecules upwards through the xylem, creating tension in the water molecules.
    • Tension causes the column of water to be stretched.
    • Cohesive forces between the water molecules are strong enough to prevent the column breaking.
    • The strong lignin (impermeable carbohydrate) prevents xylem vessels from collapsing inwards.
  5. How does root pressure transport water in a plant ?
    • Root pressure contributes to the upward movement of water molecules by-
    • The built up pressure caused by water moving into the xylem tissue of the root.
  6. What contributes to the upward movement of water molecules?
    • Root pressure, cohesion, adhesion, transpiration and tension.
    • *~osmosis~
  7. What maintains the water molecules in liquid form when being transported?
    Water molecules having hydrogen bonds between them maintaining them in liquid form is Cohesion of water molecules.
  8. What between water molecules maintain them in liquid form?
    Hydrogen bonds between the water molecules maintaining them in liquid form is cohesion of water molecules.
  9. What is cohesion?
    Water molecules sticking together (maintaining them in liquid form) by having hydrogen bonds between them.
  10. What is adhesion of water molecules?
    Water molecules sticking to sides of xylem vessels.
  11. In adhesion, what does the water molecules stick to, in being transported in a plant?
    In adhesion, water molecules tend to stick easily to the sides of xylem vessels.
Author
jacquelineglynn
ID
356740
Card Set
Chapter 31-32 Nutrition and Transport in a Flowering Plant
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