Xylem helps in the upward transportation of water from the roots to the other plant parts. Phloem helps in th downward transportation of food from leaves to the other plant parts.
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Xylem:Xylem contains elongated trecheid cells,tubular vessels,fibres and parenchyma.
Xylem transports water and minerals.
It is responsible for transport of  materials away from root.
Phloem:Phloem contains long sieve cells and sieve tubes,companion cells,fibres and parenchyma.
Phloem transports food materials.
It helps in transportation of materials away from photosynthetic parts of plants