Download Module 2 Exchange and transport

Settler
• Design a structure that is self powered,
extracts water from the ground and can lift
water 20m high
Module 2
Exchange and transport
1.2.13 Transport in plants-
Starter
• On your plain piece of A4 paper you have 3
minutes to draw a diagram of a plant and label
everything you know from KS4 on plant
transport
Learning Objectives
Success Criteria
• Draw the structure of xylem and
phloem tissues in dicotyledonous
• Describe the distribution of
plants (Grade D – C)
xylem and phloem tissues in
dicotyledonous plants, with • Describe the distribution of
xylem and phloem tissues in
aid of diagrams and
dicotyledonous plants (Grade C –
photographs
B)
• Explain the importance of plant
transport systems(Grade B – A)
Dicotyledon
• Di = Two
• Cotyledon = Seed leaf
• Used to classify flowering plants
Monocotyledon
Dicotyledon
Why do plants need transport systems?
Some small or primitive plants, such as mosses, absorb all
the nutrients they need directly from their environment.
Larger plants do not have a
large enough surface area to
take in what they need. Like
most multicellular animals,
they have developed
specialized tissues for
transporting water and
nutrients to all their cells.
Plants that have specialized
transport systems are known
as vascular plants.
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© Boardworks Ltd 2008
Vascular Tissue
Mainly xylem and phloem
Also includes cambium and possibly other
tissues for support
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Vascular Bundle in Root
Cambium
Vascular Bundle in Root
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Large central xylem in 3-5 pointed star
Phloem found between arms of ‘star’
Strength to resist crushing and pulling
forces
Vascular Bundle in Shoots
Vascular Bundle in Shoots
Vascular Bundle in Shoots

Discrete bundles give strength but also
allow flexibility

Xylem is adaxial- closer to centre of stem

Phloem is abaxial- closer to the exterior
Vascular Bundle in Shoots
In older woody plants the
vascular bundles are not
discrete (they form a
continuous ring)
Vascular Bundle in Leaves
Vein
Make up the midrib
and veins of a leaf
Midrib
Vascular Bundle in Leaves
Vascular Bundle in Leaves
Vascular Bundle in Leaves
Observing Xylem and Phloem
Using Microscope

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Try to observe the vascular bundles in
roots, shoots and leaves
Start on the lowest magnification and work
up
When you have a clear image on the
highest magnification possible draw what
you can see
Remember to use a pencil and draw
diagrams a reasonable size – label,
•Draw the structure of xylem and phloem
include any definitions
tissues in dicotyledonous plants (Grade D
– C)
Task

Explain the need for transport systems in
multicellular plants in terms of size and
surface area to volume ratio.
Use page 68 – OCR book to help

PA

Explain the importance of plant transport
systems(Grade B – A
Past Paper Questions –
Answers on whiteboards!!!
1) You are given an outline of a
dicotyledonous root.

Sketch in and label the xylem and phloem in
the diagram. Individual cells should not be
shown [2]
Xylem
Phloem
1 Mark for correctly identifying xylem and phloem
1 Mark drawing 3-5 pointed star with phloem between
arms
2a) Name the tissues A-C
[3]
b) Describe how the distribution of B and C would differ in
a dicotyledonous root [2] •Describe the distribution of xylem and
phloem tissues in dicotyledonous plants
(Grade C –B)
2a) A- Epidermis
B- Phloem accept pholem etc
C- Xylem
b) 1- Central
2- Star-shaped/3-5 arms/AW/ xylem
3- No pith/hole/AW
4- Phloem between xylem/ on different
radii/AW
Accept points on a diagram (xylem and
phloem need to be labelled)
Vertical section through part of a leaf of a dicotyledonous
plant
3) Identify A, B and C
[3]
3)
A- Xylem/Xylem vessel(s)/ tube/ element/
lumen of xylem (vessel)
B- Guard Cell(s)
C- Phloem/ sieve tube(s)/ sieve
plate(s)/sieve element(s)
4a) Name this organ
[1]
b) State in which of the tissues, A-D, xylem vessel elements
are found
[1]
4a) Root
b) D
Plenary

Label each photograph with it’s structure