1) Transport In Plants Flashcards
1
Q
Xylem tissue transports…
A
water + soluble mineral ions
up
2
Q
Phloem tissue transports…
A
Assimilates e.g. sugars
up / down
3
Q
Dicotyledonous plants
A
2 seed leaves
4
Q
Xylem + phloem in young root
A
- VB = centre of young root
- central core of xylem (shape X)
- phloem between arms of X shaped xylem tissue = strength to withstand pulling forces in roots
- endodermis = around VB
- pericycle = layer inside endodermis of meristem cells
5
Q
In non-woody plants…
A
bundles = separate + discrete
6
Q
In woody plants…
A
Bundles = separate in young stems
–> become continuous ring in older stems
= complete ring of VT under bark of tree
= strength + flexibility to withstand bending forces on stems + branches
7
Q
Order in VB (stem)?
A
- xylem = inside
- cambium = middle –> layer of meristem cells that divide = new X+P
- phloem = outside
8
Q
Vascular bundles form the ______ + ______ of a leaf
A
Midrib + veins
9
Q
Process of dissection of plant materials?
A
- cut thin section (scalpel/razor) of celery / impatiens (1/2 cells thick)
- section on slide
- few drops acidified phloroglucinol on section
- cover with coverslip
- low power on light microscope
10
Q
What is the stain phloroglucinol specific to?
A
Lignin
- xylem + sclera chump contain lignin in walls
11
Q
Why do plants need a transport system?
A
To move:
- water + minerals from roots up to leaves
- sugars from leaves to the rest of plant
