| 1. | It must be supplied to the growing parts via the xylem.
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| 2. | Systemic fungicides are taken up and redistributed through the xylem vessels.
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| 3. | Unlike other gymnosperms, they possess vessel elements in the xylem.
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| 4. | They contained an exarch xylem strand containing G-type tracheids.
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| 5. | The vascular cambium produces new layers of secondary xylem annually.
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| 6. | The parent cells of the vascular cambium produce both xylem and phloem.
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| 7. | Eventually, aphids consume xylem sap to dilute the stomach osmotic pressure.
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| 8. | Root pressure may be important in refilling the xylem vessels.
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| 9. | When xylem pressure increases, the cavitation gases may redissolve.
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| 10. | This makes them relatively immune to xylem embolisms caused by freezing temperatures.
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