Summary
OCR A-Level Biology Plant Transport(2) Summary
A HandWritten summary which contains all the necessary A* Content for Transport in Plants at OCR A-Level Biology.
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Stomata Close when :furgor is low
Opening Guard cells pump in solutes by active transport sturgor increases
. :
Closing
:
Hormonal
signals from the roots
trigger turgor loss ->
water is conserved
Factors
Affecting transpiration light :
,
humidity , temperature ,
Air movement, Water availability
~sideplate
phloem A transports organic
S
living fissue which solutes
:
mpanion
CO e
⑧
sincture translocation
↳
sources Green leaves and stems
storage organs food stores
:
, ,
fruit or
Sinks Roots meristems
developing food stores i. e seeds
:
.
, ,
Phloem loading :
-Symplast Route Assimilates through cytoplasm and plasmodesmata passive
:
move the
-Apoplast Route :
7 Ations removed from
by active transport
are the
companion cen
.
H returns down
gradient via cotransport protein sucrose is co.transported into the
2 .
a a cen
.
3
Water moves into
high solute concentration companion cels building turgor pressure ,
4 and
Water assimilates are forced into the
phloem and move around the plant by mass flow
.
to areas of lower pressure the sinks
Phloem
Unloading Sucrose diffuses into sinks rapidly down a concentration gradient
:
Xerophytes
:
Plants adapted to live in areas of low water
availibility
↳ Adaptations :
·
Thick waxyfuticle Sunken Stomata
-
Fewer Stomata and leaves
-
Curled leaves
-Hairy leaves Parenchyma tissue to store water Leafloss
Long roots
-
- -
Hydrophytes Plants adapted to live in agreous environments
:
↳ Adaptations :
Thin or no
waxy Cuticle
-
Reduced Structure Wide flat leaves
,
-
Small roots
-large surface area Air sacs ->
floating
-
Arenchyma with air
space
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