| 11. | Root pressure is caused by this accumulation of water in the xylem pushing on the rigid cells.
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| 12. | Such bleeding is similar to root pressure only sugars, rather than ions, may lower the xylem water potential.
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| 13. | Maples use root pressure each spring to force sap upwards from the roots, squeezing out any air bubbles.
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| 14. | In 1880 he stated that the movement of water in plants is due to both transpiration and root pressure.
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| 15. | But the delay gave free trade opponents such as the AFL-CIO the time to build grass-roots pressure against renewal.
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| 16. | And similar grass-roots pressures could, some think, be a driving force of future convulsions in Chinese politics or economics.
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| 17. | In the unique case of maple trees, sap bleeding is caused by changes in stem pressure and not root pressure.
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| 18. | Krenz took over from Erich Honecker as Communist leader Oct . 18, 1989, but could not stem grass-roots pressure for reforms.
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| 19. | We want to provide them with grass-roots pressure to go in the right direction, to be the voice of the people.
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| 20. | At night in some plants, root pressure causes guttation or exudation of drops of xylem sap from the tips or edges of leaves.
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