transport within plants

Subdecks (2)

what is the transpiration stream
movement of water and minerals within a plant
how does the transpiration stream work
cohesion between water molecules pulls up
air bubbles can interfere with this cohesion by preventing interaction between water molecules
there are lots of parallel xylem allowing bypasses to overcome this
what are vascular bundles
they are responsible for plant transport
consists of xylem on the inside
phloem on the outside
and a line of canbium in the middle
what is canbium 
meristem cells
can differentiate into either xylem of phloem
what is xylem
hollow lignified tubes made up of dead cells (young xylem is living but it rapidly breaks down)
there are side pores to allow movement of water molecules between parallel xylem
what does paranchyma do
they fill the gaps between xylem and therefore strengthen the structure
where can you find sieve tube elements
at the top and bottom of the hollow tubes that make up phloem
where can you find companion cells
against the hollow tubes within phloem
theyre filled with mitochondria to provide energy to the sieve tube elements