Difference between vessel and sieve tube

 Sieve cell

• The components of phloem are sieve cells.
• Construction of the sieve cell's terminal walls is completed.
• Through the pores, liquid food is transferred to a neighboring cell.
• The sieve cell's living existence is preserved by the presence of a companion cell.
• A small amount of protoplasm could be found in the sieve cell.

Vessel

• Xylem is made up of vessels.
• The terminal wall dissolves and a continuous channel is created.
• The channel carries water and minerals.
• Vessels are alive when they are young, but they die when they reach maturity.
• There is no protoplast in mature vessels.