5 Written questions
5 Matching questions
- What two things is the rate of water flow to a plant dependent upon?
- Water has a high laten heat of vaporization. What is this and why is it important for plants?
- What is water potential?
- Why doesn't water boil under the tension created during transport in the xylem?
- What is the chemical potential of water?
- a the measurement of free energy of water per unit of volume. (J/m^3)
- b 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
- c the cohesion and adhesion properties of water make the liquid to vapor activation high in water, within the xylem the energy is not available to under go the change
- d the size of the pressure gradient at the root tip and the soil near by and soil hydraulic conductivity
- e 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 Multiple choice questions
- in plants with very elastic cell walls there can be a change in water potential resulting in a large change in water volume, they can swell with increased water availability.
- concerted movement of groups of molecules on mass. Responsible for long distance transport in the xylem and for much of the water though the soil and cell walls of plants.
- this includes things such as the particle diameter and the surface area per gram of soil, this affects the adhesion properties of water
- it is the effect of dissolved solutes on water potential. The solutes reduce free energy of water therefore increases disorder (independent of specific nature of solute)
- surface tension, adhesion and cohesion. the capillarity of a liquid
5 True/False questions
What are the two main water transport processes? → this is driven by pressure gradients
What are nucleating sites and how are the reduced? → they are sites that could provide the action energy required for water to undergo change for liquid to gas. This can occur due to gas bubbles and is avoided in the xylem via piths in water transfer which are to small for most bubbles to pass.
In most plants as turgor pressure approaches zero what happens to the relative cell volume? → there is a negative hydrostatic pressure
What can reduce tensile strength in a water column? → gas bubbles
What constitutes your stomatal complex? → guard cells and subsidary cells found in the dumbell shaped guard cells of monocots