Explain adaptations of the xylem to it's function

Question

Explain adaptations of the xylem tissue to it's function.

Answer 1

1.Are made of dead cells placed end to end so as not to absorb water
2.Their walls are thickened with lignin to prevent them from collapsing as water is being transported up the plant.
3.Have bordered pits to allow for the passage of water in and out of the lumen 
4.Are thin and long to allow for capillarity

Answer 2

Has phloem tissues that transport manufactured food substances from the leaves to other parts of the plant.
Has xylem tissues that transport water and mineral ions from the root through the stem to the leaves.