← Water Test
5 Written Questions
5 Matching Questions
- What two reasons cause hydrostatic pressure become negative with a reduction of water in the soil?
- What constitutes your stomatal complex?
- Why doesn't water boil under the tension created during transport in the xylem?
- What are nucleating sites and how are the reduced?
- What is an exodermis?
- a adhesion and surface tension of water (more negative with increase curvature)
- b 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
- c guard cells and subsidary cells found in the dumbell shaped guard cells of monocots
- d 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.
- e a layer on the outside of the epidermis that is not water permeable
5 Multiple Choice Questions
- transpirational water loss, xylem transport, water movement in soil and transport through layers of living cells
- the loss of water. ~97% absorbed by plant, transported and evaporated through the leaf.
- in protoplast volume
- it is pulled up from the roots via a negative hydrostatic pressure
- 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.
5 True/False Questions
What two things is the rate of water flow to a plant dependent upon? → the absolute concentration difference (moles/cubic meters) this is effected by temperatures
What properties of water generates the physical forces to pull water up through the plant? → surface tension, adhesion and cohesion. the capillarity of a liquid
What drives xylem water transport? → the measurement of free energy of water per unit of volume. (J/m^3)
How is apoplast movement regulated? → 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
Explain how water in soil depends on soil type and structure → this includes things such as the particle diameter and the surface area per gram of soil, this affects the adhesion properties of water