Transport systems
Year 11: Biology
http://intranet.cbhslewisham.nsw.edu.au:82/science/concepta.asp?conID=13&resource=1
Retrieved 4 June 2011
Outcome:
Explain the relationship
between the requirements
of cells and the need for
transport systems in multi
cellular organisms



How do materials which are
essential to plants and animals
reach the cells?
For example how do AA’s reach the
cells when produced in digestion
And how is waste transported away
from cells ?
 Outcome: Outline the transport
system in plants including:
-
-
Root hair cells
Xylem
Phloem
Stomates and lenticles
 Flowering
plants have three main
parts;
Roots, stems and leaves
 Roots
collect water and minerals
from the soil
 These
are then transported through
the stem of the plant
 Leaves
absorb sunlight and
collect carbon dioxide
 They
use CO2 , sunlight and
water to produce glucose.
 This
process is photosynthesis
and occurs in the chloroplasts

This glucose fuels respiration

This occurs in the mitochondria


Have a look at your diagram of a
leaf… Look for the vascular bundles.
This is the veins that run through a
leaf, which transport water and
minerals.
 Vascular
bundles are made up of
Xylem and Phloem. Refer to the
diagrams I have given you
 Xylem
leaf
 The
carries the water through a
branching of the veins provides
a large surface area to effectively
supply water across a leaf
 Phloem
supplies sugars to other
parts of the plants
 Roots:
contain an extensive
network of pipes which transport
materials
 These
roots have a large surface
area-providing area for water and
mineral absorption from the soil
 Thin
root hairs on the roots also
increase this effect of the
surface area
Xylem and water transport
 Lignin inside the xylem
thickens and strengthens the
structure of the Xylem,
making it like the trachea to
our lungs
 Water
and dissolved minerals
are transported through the
xylem
 They
pass through the root
hair cells, through the root
tissue and into the xylem
 The
water and salts are
drawn up to the leaves.
 They
pass out of the leaf
xylem and into the leaf
tissue
 At
this stage some of the water
is used for photosynthesis
 However
much of the water
diffuses out out of the
stomates- find this on your
diagram!

This movement is called the
TRANSPIRATION STREAM and the
evaporation through the stomates is
called TRANSPIRATION.