Summary
Summary Topic 4 Plant Structure and Transport
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Edexcel Biology Topic 4 Plant Structure and Transport, Xylem, Phloem, Sclerenchyma, Cohesion Tension Theory, Mass Flow, Translocation, Source to Sink.
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Transport andstrength in Plants
Function : -
mechanical support
-
water and minerals (roots to leave
around the
distribute the products of photosynthesis plant
-
S.I units
Specialised cells -
Vascular bandles >
-
Kylem phloem
,
sieve tubes ,
schevenchyma
in stem: cambian
-
Support and transport
ccylem
Structure :
-
large cells + thick cell walls
-
column of cells
- dead cells
-lignin impregnated into Cellulose provides strengt water ,
proof prevents
Osmosis
-
tonoplast breaks down :
autolysis of cell contents > action
of enzymes
no nucleus eg
. .
> no end
-
walls +
highly perforated
tubes transport structure
>
-
long = +
Transport : -
transports water and mineral ions
-
one direction (upward transpiration stream)
-
cell turgor -
remain upright
-
supply H20
for light dependent
Adhesion
theory
dipolar water cohesive properties
-
=
to the wall
-narrow stick Joylem climbing
↳ pulls
xylem during high transpiration
Cohesion tension
theory
highly branched in leaves > increases SA:V ratio
for photosynthetic products
- -
, S.I units
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