| 21. | Xylem cells are elongated cells with lignified secondary thickening of the cell walls.
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| 22. | Water then diffuses from the soil into the root xylem due to osmosis.
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| 23. | E . amylovara typically makes its entry into its host xylem or flagellae.
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| 24. | Siphonosteles have a region of ground tissue called the pith internal to xylem.
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| 25. | They are usually associated with the xylem and phloem of the vascular bundles.
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| 26. | Watermark disease affects infected trees by occluding the xylem vessels, impeding circulation.
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| 27. | The Cohesion-tension theory explains how leaves pull water through the xylem.
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| 28. | Most of these cells transform into xylem and phloem.
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| 29. | Gall formation results from the overproduction of xylem tissue stimulated by the fungus.
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| 30. | Roots build up pressure when the subterranean xylem draws water from the surrounding soil.
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