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Summary Alevel OCR Biology A notes on Transport in Plants
Alevel OCR Biology A notes on Transport in Plants from an A* biology student. Plus diagrams.
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Transpar in plantse
-large organisms:↑transport distances, I SA:vd ratio, I activity cul
Every
-
plant can reeds H20, ColicO+ niceral ian
Plants 4 by branches,
-
SA:val salt thin leaves, root hairs
Plant cells metabolic ↓ demand for for aerobic respiration
-
tissues have to rate or
=
+
of
-
mass flow:
b ull movement materials
=bring substances quickly from are exchange site another
to
=maintain diffusion gradient at exchange sites
bundle c entre core
roch= vascular in xylem in
+
=ensure effective cell activity
vascular bundle
> stems: around outside
-Tyler -> H20 mineral love, stuctural
support food storage, have:
v ascular bundle midrif
-
+
=phloem -> sucrose +
mutrients
lignified cell strength
walks: wich stand
=
hydrostatic presu=
-xylem=tracheid cell-long, narrow, tapered
impermachin
vessel
3
all w/ pits now coucpse
t
- water
conducting cells
-transpiration =vessel elements large
-
trichered a l l walk no
+
end plates when mahre)
lignin + cellubse
-
↳
-xylem parenchyma
dissamer
word to
attainingagainnen
arow man
Phber
-Schrenchyma cells (fibres +
schreich) Corees arent
delayed.
=No protoplasm (dead cub) to
=
delay of max flow
-Pils w alk
in lateral
-
H20 movement continual How
=
-small vessel diameter =
prevents 130 column from breaking t
helps capillary action.
phloem=
-
side plates w/ side pares continuous movement
-
of organize compands
-
active -
translocation =allose assimilates
cell wall-strength withstand hydrostatic pressure more
= =
2 way flow,
-
sarce -> sink =No nucleus, vacuole/riboscre:m aximise space for assimiate translocation
-
wlce
-thin cytoplasm =
↓ trition facilitate
=
movement of assimilates.
-
Comparison cells connel
=
metaboism of associated side tube +
load mload
sugas
->
puler
=Nucleus +
arganelles melabdic support
=
helps
-
load unload
+
assimilates
-transport plasma membrane protein assimilates in tout side tube elements
-
-many mitochondria provide ATP for =
active transport of assimilates in all of comparison cells.
=Plasmodesmata:l ink side
to tube elements organic compands
-
from comparison cell to side tube
(seed leaves),
-
Dicotyledons seec w/2 cotely done vein broad blades:
hot surface, petioles:s talls,
=
network, have w/
tap rock
w/ lateral branches
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