8/18/2019 BIOL2761

1/4

SolutePotential

WaterPotential Pressure

(MPa)

na-100 naOutside

Air

-1.5-0.9

Mesophyll cellAir

-0.5-0.7

yle!

-0." #0.5$oot cell

Stomata:

8/18/2019 BIOL2761

2/4

%uestion 1

&istin'uish eteen os!otic* !atric and pressure potentials.

%uestion +

What aspects o, ater !ae it such an essential co!ponentaspect o,plant 'roth acti/ity

%uestion

&istin'uish eteen !ass 2o and di3usion. Where does each o,these processes occur in the SPA4

%uestion

From soil to the steleSymplastic transport: _________________

8/18/2019 BIOL2761

3/4

__________________________________ ____________________________________________________________________

 Apoplastic transport: ___________________________________________________ __________________________________

__________________________________

%uestion 5

a. Ψsoil =Ψ _____+ _____ + _____

b. In well-watered soil Ψ soil = ____ since ____ = 0

c. In a drying soil ____ becomes an important factor

d. Water enters the root when the 

Ψ cell of the root is more _______

than the Ψsoil

e. What is the isible eidence of root press!re" _____________________________

 ____________________________________________________________________ 

f. What ca!ses root press!re"_______________________________________________________________________________ __________________________________

__________________________________ __________________________________

%uestion "

a. #ores thro!gh epidermis of leaes $% stems& are called__________________

b. Si'e of stomatal apert!res is controlled by ___________ cells.

c. Water can moe from the air in the s!b- stomatal space to the

atmosphere ia open stomates if the relatie ______________ _____ forwater is lower in the air o!tside

d. Water lost from the air in the s!b-stomatal space is replaced fromwhich parts of which cells" _________________________________

e. What happens to the Ψ m of these as a res!lt"________________________

8/18/2019 BIOL2761

4/4

f. (his creates a water potential gradient with the inside of these cells% water moes down it. So what happens to the Ψ inside these cells"______________________g. A )*noc* on e,ect to neighboring cells sets !p a water potential

gradient between the ________ essels % the cells s!rro!nding the____________________

%uestion 7

 Write short descriptions for the images below.