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Comparing xylem and phloem vessels

There are some important differences between the two transport vessels in the plant vascular system: xylem and phloem.

Xylem Phloem
Cells Dead cells Sieve tube elements

Companion cells

Substance carried Water and mineral salts Sugars, amino acids, hormones
Direction Unidirectional (upwards) Bidirectional
Mechanism of transport Passive process (capillary action, transpiration) Active process (uses energy)