Why pressure potential of plasmolysed cell and xylem vessels is negative
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Negative pressure potentials occur when water is pulled through an open system such as a plant xylem vessel. Withstanding negative pressure potentials (frequently called tension) is an important adaptation of xylem. This tension can be measured empirically using the Pressure bomb.
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Pressure potential is negative in a plasmolysed cell and xylem vessel, positive for a turgid cell and zero for a flaccid cell. If a plant cell is placed in a hypertonic solution, the plant cell loses water and hence turgor pressure by plasmolysed.
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