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transport processes, Cross link description: At the beginning of the…
transport processes
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water potential
cells
in growing regions
keep osmotic potential
and water potential
very negative
by
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hydrolyzing
starch molecules
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when too much
water loss occurs
have
incipient plasmolysis
-
can lead to
plasmolysis
protoplast pulls
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long-distance transport
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xylem
water properties
-
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heavy
-
there is a
tension on
water molecules
therefore
pressure potential is
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xylem water transport
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if stressed
-
tension on
water columns
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causes
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embolism
-
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occasionally
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Cross link description: At the beginning of the chapter, isolation mechanisms were introduced as an important factor in transport. Completely impermeable membranes are an example of isolation mechanism in the form of an isolation barrier of a cell.
Cross link description: Water potential plays a major role in the opening of guard cells. The absorption of potassium into the guard cells causes the water potential in the guard cells to be more negative than the surrounding cells, and thus, the water enters the guard cells. This causes the guard cells to swell to swell and ultimately, opens the stomata.
Cross link description: Plants release water in the air by transpiration. Their are two types of transpiration: transstomatal and transcuticular. Transstomatal transpiration is most important in allowing water to be able to move up a plant.
