Xylem transport system
Water and minerals are transported up through the plant stem in xylem vessels.
Xylem is a tissue consisting of dead, hollowed-out cells that form a system of pipes.
The walls of xylem cells are lignified (strengthened with a substance called Carbohydrate material lining the xylem vessels providing strength and support.). This allows the xylem to withstand pressure changes as water moves through the plant.
Watch the video below to see how xylem in celery can be examined under the microscope