Transport Tissues In Plants Flashcards
What are the main transport tissues in plants
Xylem and phloem
What is the role of the xylem
carries water and dissolved minerals from the roots to the photosynthtic parts of the plant
What is the role of the pholem
transport dissolved product of photosynthesis from the leaves to where it is needed for growth or storage as starch
What is cambium
Layer of unspecalsised cells that divide giving specialised cells
They can turn into xylem or phloem
The growth of a xylem 1/7
The first xylem to form is called protoxylem it is capable of stretching and growing because the walls are not fully lignified
How do water move out of xylem
through unlignifed areas or through specialised pits in the walls of the xylem vessels
What is the evidence of water movement through xylem
Ringing expereiment
Eosin dye in water
How is autroradiography achieved 1/3
Plant given water with detrium (radioactive isotope of hydrogen) in
How is autroradiography achieved 2/3
The radioactive substance is taken up
How is autroradiography achieved 3/3
substance is tracked by placing the plant against the photographic film to produce an autoradiograph
Pholem tubes are made up of two types of cells what are they?
Sieve tube elements
Companaion cells
How do sieve tubes form
STE are living cells and are joined end to end
The end of sieve tubes contain what?
Sieve plate
What is the role of the sieve plate
Contains lots of holes to allow solutes to move from one cell to the next
Why dont the sieve tube cells contain no organelles aand very little cytoplasm
To create more space for soloutes to be transported
