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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:
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%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: _________________
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__________________________________ ____________________________________________________________________
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"________________________
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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.