Xylem and pholem + water uptake, plant transport

Xylem

Vascular tissue that transports water and minerals. Strong walls provide support

Phloem

Vascular tissue that transport sucrose and amino acids. Perforated end walls (sieve plates)

Xylem + phloem position in roots

Central vascular bundle. Xylem in the centre, phloem on the outside.

Xylem + phloem position in the stem

Ring of vasular bundles, xylem on the inside, phloem on the outside

Xylem + phloem position in leaves

Vascular bundles in midrib and leaf veins. Xylem top, phloem bottom

Xylem vessels - structure and function

Thick walls with lignin (provide support for the plant, makes the cell impremable, prevent water and ions passing through), no cell contents, cells joined end to end with no crosswalls (forms continous tube, allows water and mineral ions to flow through vessel from cell to cell)

Root hair cells

Absorb water and minerals from the soil, large surface area of root hairs increase uptake of water and mineral ions

Pathway of water

Soil →root hair cells→root cortex cell→xylem→Mesophyll cells (leaf)