Xylem Flashcards
1
Q
What do xylem vessels transport?
A
They transport water and minerals from root to other plants.
2
Q
where does water move up?
A
- the stem
- water will be carried up all the way up the leaves via the xylem vessels inside the cell
3
Q
what is xylem tissue made up of?
A
made up of xylem vessel elements, stacked end to end forming xylem vessels
4
Q
are xylem living?
A
- they begin as living cells
- they differentiate and lose all of their contents and lose their end walls to become continous hollow tubes “non-living”
- these vessels are very narrow
5
Q
what is inside the cellulose cell walls?
A
Lignin
6
Q
what is lignin?
A
a very strong and waterproof substance
7
Q
what is there is the walls of the xylem vessels?
A
Tiny holes called pits in the walls of the xylem vessels
8
Q
what are pits?
A
they allow water move water sideways into neighbourings vessels if there are any blockage/air locks
9
Q
what is the mechanism by which water moves up the stem?
A
- when water moves across the root, it was the movement of individual molecules from cell to cell by osmosis
- it moves into the xylem vessels in the stem, by osmosis
- when water moves up the xylem in the stem, it acts as a whole column for of water together - mass flow
10
Q
what type of tubes are the xylem made up of?
A
hollow tubes made up of dead cells
11
Q
How are the phloem and xylem arranged ?
A
In vascular bundles
