5 Written questions
5 Matching questions
- Transpiration is dependent upon what?
- What are the two main water transport processes?
- What kind of pressure is between the xylem and cells?
- How is apoplast movement regulated?
- What properties of water generates the physical forces to pull water up through the plant?
- a 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
- b difference in water vapor concentration in the air spaces in the leaf and the external air
- c molecular diffusion and bulk flow
- d there is a negative hydrostatic pressure
- e surfaces tension and adhesion at the evaporative surfaces of leaves
5 Multiple choice questions
- the formation of gas bubbles
- into the cell walls of the mesophyll where water vapor diffuses through leaf air spaces through the stomatal pore and across the boundary layer
- the concentration of the solute and the pressure gradient
- the measurement of free energy of water per unit of volume. (J/m^3)
5 True/False questions
Fisk's first law: → diffusion rate is directly proportional to the concentration gradient
Water has a high laten heat of vaporization. What is this and why is it important for plants? → 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.
What drives transpirational water loss? → the loss of water. ~97% absorbed by plant, transported and evaporated through the leaf.
Specialized arrangements of what in guard cells plays a role in the opening and closing of the stomates? → the absolute concentration difference (moles/cubic meters) this is effected by temperatures
What is the chemical potential of water? → it is the relative expression of the free energy associated with water, it is the difference between the potential as a given state and the potential of substance at a standard state