How is xylem vessels differ from sieve tubes?

Xylem vessels and sieve tubes serve different functions in plants. Xylem vessels are responsible for transporting water and dissolved minerals from the roots to other parts of the plant, while sieve tubes are involved in the transport of sugars and nutrients from the leaves to the rest of the plant. Additionally, xylem cells are typically dead at maturity and have thick, lignified walls, whereas sieve tube elements are living cells that have specialized structures called sieve plates to facilitate the flow of sap.