What are the various types of cells present in xylem? Write their functions.

The various types of cells present in xylem are

1. Xylem vessels — A xylem vessel is not one cell but a series of cells joined from end to end to form a long tube. Its function is transportation of water.
2. Tracheids — Tracheids are usually long and narrow cells that taper at the ends. Both tracheids and vessels do not have living protoplasm at maturity. They are involved in the transportation of water from the roots to the upper parts of the plant.
3. Fibres — Fibres provide strength to the tissue. They also lack living protoplasm at maturity.
4. Xylem parenchyma — Xylem parenchyma is the only living component of xylem. It helps in the conduction of water and also stores food.