features of a transport system Flashcards
lle mae xylem and phloem
phloem on the inside of the xylem
xylem in the middle
what is the vasuclar tissue fromed of
xylem and phloem
what do the xylem and phloem form
vascular tissues
2 functions of xlyem
transport of water and dissolved minerals
providing mechanical strenght + support
what does xylem consist of
dead lignified tracheids and vessils
what does xylem do
conduction or transport of water and salts
how easy can water travel in xylem
easy - no barriers to stop flow
what does vascular tissues provide in the stems
flexible support
resistance to bending strain
what does vascular tissues provide in the leaves
arrangement of vascular tissues in the midrib and network of veins also gives flexible strength
what does vascular tissues provide in the roots
helps the anchorage of the plant
where is the greatest water uptake
root hair zone
whats good about the root hair cell
surface area of the root is enormously increased by the presence of root hairs
freely permeablbe
how can water travel? (3)
apoplast
symplast
vacuolar
apoplast water movement
through the cell wall
synplast water movement
through the cytoplasm and plasmodesmata
vacuolar water movement
from vaculoe to vacuole
whats the name of the dark strip which is waterproof in the plant cells thingies
casparian strip
casparian strip thing about it
waterproof
because contains suberin
what does casparian strip contain which makes it waterproof
suberin
what does casparian strip do
water potential of endodermis cell raised by water being driven in by casparian strip
what does the casparian strip actually do
prevents further transport through the apoplast
what needs to happen for watee to travel past the casparian strip
water must enter the cell by osmosis
enter the symplast pathway
what needs to happen for the water to move around the casparian strip
water potential in xylem must be much more negative than the water potential of the endodermal cells
how is water potential of endodermis cells raised
by water being driven in by the Casparian Strip
why is casparian strip essential
rehulate salt movement
protect against entry of posions and fungal pathogens
how are minerals taken up
by root hairs by active tranport
moves through apoplast paethway and then through the transpiration steam
ions enter cytoplasma and plasmodesmata through symplast pathway
how are salts put into the vasuclar tissue
activley pumped
this makes water potential of xylem more negative which causes water to enter the xylem by osmosis
root pressure
