Friday, July 31, 2009

Plant/Flower help! 10 points!?

1) the pressure of driving water up through a plant is created where?


2) does cohesion or adhesion try to pull water up a tube?


3) How does the size of a tube effect the height at which water ascends?


4) A pot of wet soil will remain wetter long if there is or isn't a plant in it. Explain.
Plant/Flower help! 10 points!?
a) Root pressure drives water up





b) Cohesion (water molecules "stick" to each other and pull each other up)





c) Water will ascend higher in a tube with smaller diameter because of adhesion. Adhesion is where water molecules stick to the container they are in - in this case the tube. A smaller tube means more of the water molecule will adhere and so they can rise higher.





d) It will remain wetter longer if there isn't a plant in it. Evaporation of water from the soil surface area will be the same both ways, but when there is a plant in the pot, transpiration will also occur where water will be pulled from the soil into the plant and then evaporate from the leaves.make up

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