Label and annotate the phloem, xylem
and meristem on the laminates
http://tinyurl.com/treb1
2. Flowering plants have two tissues to transport materials, xylem and
phloem. The diagram below shows the outline of a transverse section of
the root of a dicotyledonous flowering plant.
Sketch in and label the areas occupied by the xylem and phloem.
Booklet Page 6
[Total 2 marks]
Memorise this….
Recreate!
Xylem
Xylem
Hollow Dead cells end to end
Continuous Tubes (Narrow)
Strengthened with Lignin
Pits in wall
Allow movement across
No cell contents, no nucleus or
cytoplasm, no end walls
Page 7
How Xylem is Adapted for its role:
Structure/Feature
How adaptation works
Dead cells aligned end to
end in a continuous
column
Narrow tubes
Lignin deposited in the
walls
Pits in the lignified walls
No end walls or cell
content
Memorise this….
Recreate!
Phloem
Two types of cell: Sieve Tube
elements and Companion Cells
Sieve Tube elements:
Little cytoplasm and no nucleus
End to end to make a tube
Cross walls perforated by pores
– Sieve plates
Phloem
Companion Cells
Large nucleus and dense
cytoplasm
Lots of mitochondria –
ATP for active processes
Linked by plasmodesmata
How Phloem is Adapted for its role:
Structure/Feature
Sieve tube element
Mitochondria in
companion cell
Little cytoplasm
plasmodesmata
How adaptation works
Label diagrams in booklet and
make sure key words defined
On mini wb:
1. Describe the structure of a xylem vessel
2. Why do xylem vessels have pits
3. Explain why sieve tube elements are not true cells
Xylem
Phloem
Both Xylem and Phloem
Homework
Using
https://www.tumblr.com/
Compare and contrast the xylem and phloem
in a plant and explain how they are adapted to
their function