Transport In Plants Summary

VASCULAR SYSTEM Xylem ADAPTATIONS of




&
LEAF ROOT - dead cells by lignification xylem + phloem
- no cell contents -
EXODERMIS
-
*
XYLEM
·
· >
- fussed end-to-end -
·
PHLDEM

STEM
s ·
kcross-sections)
- lignin in cell walls (water to
pass easily)
tr

u
~ = mechanical strength




l
cortex



⑧
EPIDERMIS MERISTEM
-
- supports plant
CAMPM-8 8
-
=




Netma
(STEM CELL)
·

88(
↑
- SCLERENCHYMA
- CASPERIAN Xylem parenchyma
COLLENCHYMA STRIP
- stores food
~
have adaptations :
-

Thin SA - contains tannis

- Large
i
saig




g
non-lignified pits
WATER TRANSPORT (in
dicotyledonous plants)
Why they need them: allow water to
High metabolic rate move out
1
ROOT HAIR CELL -




Water moves in by osmosis ~ Small SA:V Lignified cell wall
(Ring/spirals)
↑
powered by active transport of mineral ions

2
CELL-TO-CELL
Water moves down the water gradient by:
TRANSPORT IN PLANTS
APOPLAST SYMPLAST
Moves through cell wall Moves through cytoplasm
Blocked by casperian strip & plasmodesmata TRANSLOCATION ↑ to it .
com


& enters RM) ↑ ↓
resulting in
J



- allows a concentration of mineral H2O I PHLOEM LOADING
diffusing in from
ions to form in vascular bundle soil ↑ dilute ⑳ SOURCE (LEAF)
making


(
- stops toxins from entering
APOPLAST ROUTE = active SYMPLAST ROUTE = passive
vascular bundle
- sucrose moves through cell walls into
>
-
- assimilates move through
VASCULAR BUNDLE
3
companion cells & STE by diffusion > cytoplasm of mesophyll cells into
>
-

Active transport of mineral ions into vascular - conc. gradient maintained by removal sieve tubes by plasmodesmata
bundle lowers the __
Y causing more osmosis of sucrose into phloem
= Root pressure I givesH2O push up xylem) a


evaporation of water at the leaf I transpiration) PROTON Ht > Ht
⑤ CO-TRANSPORTER

ISUCROSE)