BRAINCAKEXylem and Phloem
Plants have two transport tissues, xylem and phloem, together called vascular tissue. They are found grouped into vascular bundles.
Xylem transports water and mineral ions from the roots up to the leaves. Transport is in one direction only, upwards. Mature xylem vessels are dead, hollow tubes with walls strengthened by lignin, so xylem also supports the plant.
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Key terms in this lesson
- lignin
- A strong, waterproof polymer that thickens and strengthens the walls of xylem vessels, preventing them from collapsing under tension.
More in Transport in Plants
- Xylem
- Evidence for the Movement of Water Through Xylem
- Phloem
- Root Hair Cells
- Symplast Pathway
- Apoplast Pathway
- Transpiration
- Cohesion-Tension Theory
All 21 lessons in Transport in Plants · All Edexcel AS-level Biology topics