5 Written questions
5 Matching questions
- What is molecular diffusion?
- What two driving forces drive the direction and rate of water potential gradients?
- What 3 properties of water create __ which is important for plants?
- Fisk's first law:
- What is water potential?
- a the measurement of free energy of water per unit of volume. (J/m^3)
- b surface tension, adhesion and cohesion. the capillarity of a liquid
- c the concentration of the solute and the pressure gradient
- d the random collisions and exchange of kinetic energy between water molecules driving a movement down concentration gradients
- e diffusion rate is directly proportional to the concentration gradient
5 Multiple choice questions
- There are no metabolic pumps to drive water, it only occurs when water is coupled with ion (solutes) to carry it. This can occur because the loss of the free energy by the solute is greater then the gain of free E of the water. (negative net change in E is produced)
- pathway of water moving through a network of cells connected via the plasmodesmata going to the cortex driven by hydrostatic pressure
- 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
- gas bubbles
- it is influenced by both diffusion and bulk flow and driven by water potential gradients. It occurs spontaneously with these forces.
5 True/False questions
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
Adhesion: → water molecule attraction to a solid such as a cell wall or a glass tube
What is an exodermis? → a layer on the outside of the epidermis that is not water permeable
What drives transpirational water loss? → the loss of water. ~97% absorbed by plant, transported and evaporated through the leaf.
What are the 4 mechanisms and driving forces acting on water transport within the plant and between plant and the environment? → transpirational water loss, xylem transport, water movement in soil and transport through layers of living cells