water uptake and movement in plants

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what is water potential
water protential is when water always moves from an area of high water potential to an area of low water potential
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true or false- higher the water potential the less negative the number
true
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when a plant cell is full is it does not burst.... what is the cell alled when its full?
turgid
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what is pressure potential and what does it do
pressure potential is when the water pushed on the cell wall. it reduces movment into the cell
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whe the plant cell is in a salt solution water is lost. this causes the membrane to pull away. what is this called?
plasmolysis
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what are the three ways water moves between cells
1. vacuolar 2. symplast 3. apoplast
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what is the apoplast pathway?
it is when the water does not pass through the membrane however through gaps of the cells and cellulose
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what is the symplast pathway?
the water moves through the membrane and won the cytoplasm and plasmodesmata
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what is the vacuolar pathway?
water moves through the cell membrane and through the vacuole and cytoplasm
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what is the caspanion strip?
it is a waxt strip which is imperiable to water which blocks the apoplast pathway
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how does the water in the apoplast pathway
the endodermal cells have more negative water potential therefore the water moves from the apoplast pathway to join the symplast pathway
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how do the endodermal cells work?
the endoermis pumps minerals into the the cells via active transport which lowers water poential so water moves in
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how is water taken up via the roots in the plant
there is lots of minerals in the root hair cells (negative water potential) the water then move in via osmosis.
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how does water move through the root into the xylem
water travels through the root via the root cortex into xylem via the symplast and apoplast pathway. when the apoplast pathway hits the casparian strip it joins the symplast pathway
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why is the apoplast pathway the main way water travels through the root
because it provides the least resistance
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why is it useful that the apoplast pathways joing the symplast pathway when travelling through the root?
it means the water has to go through the cell membrane which control whether or not substances get through to the xylem
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what are the three ways water manages to travel up the plant and what do they do?
1.root pressure 2. transpiration pull 3. capillary action
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what is root pressure
endodermis cells move minerals from cortext into xylem which drives water up the xylem
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what is transpiration pull
cohesion tension theory- water molecules attracted and join by hydrogen bonds water molecules form along collum up oxyle. when water islost via transpiration this creates pull
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what is capillary action
water molecules attracted to lignin of xylem vessle- adhesionn
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what are the main purposes of the caspaion strip
blovk apoplast pathway so ensures water and minerals pass through the membrane. active transports lowers water potential in the xylem meaning water moves vis osmosis. water cannot flow back into cortex..
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Card 2

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true or false- higher the water potential the less negative the number

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true

Card 3

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when a plant cell is full is it does not burst.... what is the cell alled when its full?

Back

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Card 4

Front

what is pressure potential and what does it do

Back

Preview of the front of card 4

Card 5

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whe the plant cell is in a salt solution water is lost. this causes the membrane to pull away. what is this called?

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