Summary Topic 4 Plant Structure and Transport

Transport and
strength 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