9.1 Transport systems in dicotyledonous plants Flashcards
Why do plants need a transport system?
To ensure all cells receive a strong supply of the nutrients they require. Especially important as a plant must be able to transport substances up their stem.
What materials do plants transport and exchange?
Carbon dioxide
oxygen
water
organic nutrients
inorganic ions
what processes do plants do?
photosynthesis
respiration
active transport
what are the two transport systems in plants?
transpiration and translocation
what is the transpiration system?
the movement of water molecules and dissolved mineral ions
xylem vessels
passive process
what is the vascular bundle?
vascular tissue distributed throughout the plant
vascular tissue is made up of xylem and phloem tissue
as well as the transport of substances the vascular bundle has structural support purposes
what is the xylem?
a large non-living tissue that transports water and mineral ions and provides support
which way do materials flow in the xylem?
up the roots to the shoots and leaves
describe xylem vessels
long hollow structures
made up of several columns of cells fusing together end to end
describe parenchyma
packs around xylem vessels
they store food
they also contain tannin deposits
what is tannin?
a bitter astringent-tasting chemical that protects plant tissues from attack by herbivores
describe xylem fibres
long cells with lignified walls that provide extra mechanical strength
do not transport water
what is lignin?
waterproofs the xylem and provides reinforcements so that they dont collapse the transpiration pullw
what are bordered pits?
where water leaves the xylem and moves into other cells of the plants
what is the phloem?
a living tissue that transports food in the form of organic solutes around the plant from the leaves where they are made by photosynthesis
