5 Written questions
5 Matching questions
- What is transpiration?
- Explain how water in soil depends on soil type and structure
- How is apoplast movement regulated?
- What is field capacity?
- 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?
- a they have secondary cell walls that are very strong and lignified, they can withstand the tension
- b the moisture holding capacity of a soil
- 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
- d this includes things such as the particle diameter and the surface area per gram of soil, this affects the adhesion properties of water
- e the loss of water. ~97% absorbed by plant, transported and evaporated through the leaf.
5 Multiple choice questions
- boundary layer resistance and leaf stomatal resistance
- the absolute concentration difference (moles/cubic meters) this is effected by temperatures
- there is a negative hydrostatic pressure
- 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.
- 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
What drives transpirational water loss? → this is driven by a gradient in water vapor concentration
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.
Sum up the importance of water potential: → the measurement of free energy of water per unit of volume. (J/m^3)
What is the difference between diffusion and bulk flow? → there is a negative hydrostatic pressure
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