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5 Written questions

5 Matching questions

  1. What is transpiration?
  2. Explain how water in soil depends on soil type and structure
  3. How is apoplast movement regulated?
  4. What is field capacity?
  5. Water under tension such as in transport in the xylem, transmit an inward force on the cells of the xylem how is this accounted for in plant cells?
  1. a they have secondary cell walls that are very strong and lignified, they can withstand the tension
  2. b the moisture holding capacity of a soil
  3. c via casparin cells in the endodermis, they contain radial cell walls composed of suberin (waxy substance) acting as a barrier to water making it cross the cell membrane
  4. d this includes things such as the particle diameter and the surface area per gram of soil, this affects the adhesion properties of water
  5. e the loss of water. ~97% absorbed by plant, transported and evaporated through the leaf.

5 Multiple choice questions

  1. boundary layer resistance and leaf stomatal resistance
  2. the absolute concentration difference (moles/cubic meters) this is effected by temperatures
  3. there is a negative hydrostatic pressure
  4. this is the energy required to go from liquid to vapor. This can help to cool the plant, allowing it to lose heat when it gets to hot.
  5. It is the formation of vapor/ gas bubble in flowing water which can rapidly collapse and produce shock waves provding energy to nucleating sites within the xylem.

5 True/False questions

  1. What drives transpirational water loss?this is driven by a gradient in water vapor concentration


  2. What influences and drives osmosis?it is influenced by both diffusion and bulk flow and driven by water potential gradients. It occurs spontaneously with these forces.


  3. Sum up the importance of water potential:the measurement of free energy of water per unit of volume. (J/m^3)


  4. What is the difference between diffusion and bulk flow?there is a negative hydrostatic pressure


  5. Symplast:transfer of water traveling between cell walls and any extra cellular spaces that have water in it on it's way to the root cortex driven by hydrostatic pressure


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