3.3 Transport in plants

what travels in xylem tissue

water and soluble minerals travel upwards

what travels in phloem tissue

assimilates, such as sugar travel up or down

dicotyledonous plants

have 2 seed leaves and the xylem and phloem tissue are found together in vascular bundles, along with other tissues such as collenchyma and sclerenchyma

xylem and phloem in the root

there is a central core of xylem, often in the shape of an X. the phloem is found between the arms of the X shaped xylem tissue → this provides strength

around the vascular bundle is a special sheath of cells called endodermis- which has a key role in getting water into the xylem vessels

just inside the endodermis is a later of meristem cells called the pericycle

meristem cells

cells that remain able to divide

xylem and phloem in the stem

vascular bundles are found near the outer edge of the cell

in non-woody plants the bundles are separate and discrete

in woody plants the bundles are separate in young stems but become a continuous ring in older stems

this provides strength and flexibility

the xylem is found towards the inside of each vascular bundle and the phloem towards the outside

in between the xylem and phloem is a later of cambium

cambium

a layer of meristem cells that divide to produce new xylem and phloem

xylem and phloem in the leaf