2. Focus on Leaves
Vascular plants are composed of
millions of living cells
Every cell needs water, minerals,
and food (sugar)
Vascular system of plants is really
two systems
Xylem transports water and minerals
to the cells
Phloem transports sugar to the cells
3. Most xylem tubes begin in the
roots and end in the leaves.
Most phloem tubes start in the
leaves and end in the roots.
Find out about the place where the
xylem ends and the phloem
begins, the leaf.
4. Leaf Collection
Stay with your group
Collect ONE leaf from as many
different plants as you can find in
5 minutes. Get leaves of all sizes.
Keep sample in the bag.
5. Sorting Leaves
Look closely at each leaf
Sort into those that show evidence
of xylem and phloem and those
that don’t.
How many of your leaves have
veins?
Are the veins all the same size?
Do the veins branch?
Sort your leaves in a new way.
6. Classification
Scientists organize, or classify, things
so they can think about them more
efficiently
A group of things that go together based
on a property or behavior is a class.
5th
graders form a class based on age. 4th
graders are a different class, etc… In
schools we classify students by age.
Geology – classify crystals by shapes and
angles of surfaces. Classify sand by
particle size.
7. Leaf Classification
Based on basic pattern of the
veins.
Botanists have developed a
systems that uses three patterns.
Palmate
Pinnate
Parallel
8. Palmate
Several large veins
extending from the
place where the leaf
stem attaches to the
leaf.
Think of the palm of
your hand and your
fingers as the main
veins.
9. Pinnate
One large vein
extending the
length of the leaf
with smaller veins
branching off.
Pinna means
feather, so a
pinnate leaf
resembles a
feather
10. Parallel
Many small veins
running the
length of the leaf.
Long, narrow
leaves, like blades
of grass, tend to
have parallel
veins.
11. Leaf Classification
Classify your leaves based on
venation pattern.
Are there other ways to classify
your leaf collections?
Leaf Shape (Blade)
Kind of edge (Margin)
Kind of attachment (Petiole)
12. Vocabulary
Classify
To organize by similar properties or
behavior
Palmate
Several large veins extending from the
place where the leaf stem attaches to the
leaf (Palm)
Pinnate
One large vein extending the length of the
leaf with smaller veins branching off
(Feather)
Parallel
Many small veins running the length of the
leaf (Grass)
13. Content
Venation
Classifying leaves by their vein
pattern
How do scientists organize objects
and information?
Scientists classify things by
putting them in groups (classes)
based on similar properties and
behaviors.
14. Homework
Read Classification, pg. 105-106,
and Summary: Vascular Plants,
pg. 107-109
Answer questions for both articles
I-check 2 quiz on Friday, 10/11
16. Summary: Vascular Plants
Describe how all the cells in a vascular
plant get sugar.
Describe how all the cells in a vascular
plant get water and minerals.
Why do its leaves turn pink when a
celery stalk is placed in red water?
In what way are blood and sap the
same?