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    Hi please can I have help with this...

    Describe one piece of evidence that supports the root pressure theory and explain how it supports this theory.
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    Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

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    (Original post by anniebrads)
    Hi please can I have help with this...

    Describe one piece of evidence that supports the root pressure theory and explain how it supports this theory.
    Introductory question: what is root pressure theory?
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    - Endodermal cells move ions into the xylem, thereby decreasing water potential- Decreased water potential leads to increased water flow into xylem- Results in higher hydrostatic pressure, with the ability to move water up through the stem/trunk of the plant

    From there, how what are some ways to test it? Do you know of any similar situations where you can test whether a system is under pressure? How about a garden hose that is hidden at both ends?
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    - Poke a hole in the middle and see if sap oozes out
    - Garden hose with a hidden nozzle. If you apply pressure at one end of the hose, water will move from one end to another. If no pressure is applied, water won't move inside. So you poke a hole in it. If water is pressurised/moving, it will spray out of the hole (path of least resistance). If water isn't pressurised/moving, nothing happens.
 
 
 
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