5 Written questions
5 Matching questions
- Because of rigid cell walls, change in cell water potential generally accompanied by change in hydrostatic pressure with little change in what?
- What two driving forces drive the direction and rate of water potential gradients?
- Explain water transport against gradients in plants:
- If bulk flow is driven by pressure gradient how is it responsible for movement of water through soil?
- What are the two main water transport processes?
- a in protoplast volume
- b molecular diffusion and bulk flow
- c the concentration of the solute and the pressure gradient
- d 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)
- e pressure is created by water via curvatures, water is going to want to move to areas of larger spaces with smaller curvatures
5 Multiple choice questions
- the positive hydrostatic pressure
- changes in radius, viscosity, concentration gradient
- it is pulled up from the roots via a negative hydrostatic pressure
- pathway of water moving through a network of cells connected via the plasmodesmata going to the cortex driven by hydrostatic pressure
- 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
In most plants as turgor pressure approaches zero what happens to the relative cell volume? → there is a negative hydrostatic pressure
What is an exodermis? → the formation of gas bubbles
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 are aquaporins and why are they important in plants? → it is the energy used to increase the surface area, the amount of surface area occupied by the interface of air and water. this is important because remember that water is more attracted to itself then to air molecules. (This is what can create contact angels) water generally wants to minimize the surface area at the air water interface
What is soil hydraulic conductivity? → the moisture holding capacity of a soil