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Bio 117 Final WVU Barry with 100- correct answers(verified for accuracy).
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Bio 117 Final WVU Barry with 100- correct answers(verified for accuracy).
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Bio 117 Final WVU Barry with100% correct answers(verified
for accuracy)
in diffusion, water goes.... - answer where the solutes go
plant hypotonic - answer turgid (normal)
plant isotonic - answer flaccid
plant hypertonic - answer plasmolyzed
water potential - answer -high-->low
- potential energy for water to move
- pure water at atmospheric pressure and room temperature has a
water potential of 0MPa
water potential is made up of - answer solute and pressure
potential
solute potential (ΨS) - answer tendency of water to move via
osmosis in response to solute concentration
-always negative
Why is solute potential always negative? - answer because the cell
always contains solutes
,pressure potential (ΨP) - answer tendency of water to move in
response to pressure
-keeps cell from bursting in hypotonic solution
-consists of water and turgor pressure
pressure potential from turgor pressure - answer -usually positive
inside living cell
- may be negative in dead cells such as xylem vessel elements
water potential gradient in vascular tissue - answer root> leaf>
atmosphere
water potential in vascular tissue three hypothesis - answer 1. root
pressure
2. capillary action
3. cohesion- tension theory
work together, not sepreately
root pressure - answer active transport of minerals and ions into
root
- root hairs and ion pumps aid in uptake of ions
- roots have lower water potential than surrounding soil
capillary action (three) - answer 1. cohesion
- water molecules are "sticky" with one another
2. adhesion
- water molecules can "stick" to the inner surface of their container
, 3. surface tension
- water molecules of the surface are pulled down by interactions
with those molecules below
cohesion-tension theory - answer - water pulled through a water
potential gradient that diffuses water vapor from leaves of the plant
-water moving up the xylem due to water sticking to each other and
the sides of the xylem
pholem - answer moves foods and hormones wherever they need
to go. alive but mostly hollow
translocation - answer movement of sugars through a plant
source - answer a tissue where sugar enters the phloem
sink - answer tissue where sugar exits the phloem
active transport in plant - answer input and output of
carbohydrates into/out if phloem
passive transport in plants - answer movement of carbohydrates
while in phloem
sugars getting in the plant - answer - companion cells are actively
transporting the sugars from sources in phloem and out into sinks
pressure flow hypothesis - answer the mechanism for movement of
sucrose from source to sink
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