7- Transport in plants (incomplete)

dicotyledonous plants (dicots)

have broad bladed leaves and petioles (stalks)

have a network of veins

have seeds that contain 2 cotyledons (seed leaves)

have a taproot system

xylem vs phloem in electron micrographs

xylem usually larger, darkly staining and more defined vessels

phloem darker than cambium, lots of small cells, may be able to see dark spots of companion cells

distribution of xylem and phloem in dicot root

distribution of xylem and phloem in dicot stem

distribution of xylem and phloem in dicot leaf vein

general distribution of xylem and phloem vessels

xylem usually on the inside (roots and stem), in the leaf the xylem is on the top (closes to upper epidermis)

functions of xylem vessel

vascular tissue that carries dissolved minerals and water up the plant

structural support

food storage

functions of phloem

transport organic compounds, particularly sucrose, from source to sink