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