5 Written questions
5 Matching questions
- Water is pulled from the xylem into what?
- Specialized arrangements of what in guard cells plays a role in the opening and closing of the stomates?
- What drives transpirational water loss?
- Explain how elasticity can be different in plants with different functional needs
- a 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.
- b cellulose and microfibril
- c into the cell walls of the mesophyll where water vapor diffuses through leaf air spaces through the stomatal pore and across the boundary layer
- d this is driven by a gradient in water vapor concentration
- e transfer of water traveling between cell walls and any extra cellular spaces that have water in it on it's way to the root cortex driven by hydrostatic pressure
5 Multiple choice questions
- they have secondary cell walls that are very strong and lignified, they can withstand the tension
- this is a porous layer between the 2 pit pairs, made of 2 primary walls and a middle lamella. This membrane helps to prevent the spreading of gas bubbles within the xylem
- tensile strength. this is the maximum force per area that a continuous column of water can stand before breaking
- gas bubbles
- the concentration of the solute and the pressure gradient
5 True/False questions
What is the driving force of water loss through the leaf? → the absolute concentration difference (moles/cubic meters) this is effected by temperatures
What are nucleating sites and how are the reduced? → gas bubbles
What is water potential? → the formation of gas bubbles
Because of rigid cell walls, change in cell water potential generally accompanied by change in hydrostatic pressure with little change in what? → in protoplast volume
What are aquaporins and why are they important in plants? → they are integral membrane proteins that form water selective channels. They are faster then travel through the lipid bilayer and can alter the rate of flow but not the direction (still passive). They can also be gated to allow for active regulation of water