Life Science Standards:
 LS2A: Students know how many multicellular
organisms have specialized structures to support
the transport of materials.
 LS2E: Students know how sugar, water, and
minerals are transported in a vascular plant.
 I &E6A: Classify objects in accordance with
appropriate criteria.
Objectives:
 Students know and can identify multicellular
organisms and their specialized structures.
 Students know how nutrients and water are
transported in vascular plants.
 Students are able to classify different leaves based
on a criteria.
Spiral Review: Vascular
Plants
 Composed of million of
living cells
 Every cell needs water,
minerals, and food (sugar).
 Vascular system of plants
o Xylem- transports water and
minerals, one direction.
o Begins in roots and ends
at leaves.
o Pholem-transports sugar to
cells, every direction.
o Begin at leaves and end
in roots.
Group Activity
 Rules
 Use indoor voices!
 Do not get out of your seat.
 Listen to your team members.
Task:
 You have 5 minutes to look closely at each leaf in your
collection.
 Sort your collection of leaves into two groups.
 Group #1 Show xylem and pholem
 Group #2 Do not show xylem or pholem
Identify
 Leaf veins: The veins that are often raised are
bundles of xylem tubes and pholem tubes.
Questions for Discussion
1. How many of your leaves have veins?
2. Are veins all the same size?
3. Do the veins branch?
Task: Look closely at the leaves and find a new way to
sort them.
Classification
Definition: Arrange in classes or categories according
to shared qualities or characteristics.
How can we classify or classroom?
How can we classify Ms.Mendoza’s students?
Reclassify
 Classify your leaves based on the venation pattern.
1. Palmate
2. Pinnate
3. Parallel
How Leaves Are Classified
 Classified by the basic pattern on veins
 There are 3 patterns to help classify leaves:
 Palmate
 Pinnate
 Parallel
Palmate Leaf
 Several veins extending from the place where the
leaf stem attaches to the leaf.
Pinnate Leaf
 Pinnate Leaf: One large vein extending the length
of the leaf with smaller veins branching off.
 Pinna means feather, so pinnate leaf resembles a
feather.
Parallel Leaf
 Parallel: Many small veins running the length of the
leaf.
 Long, narrow leaves, like blades of grass, tend to
have parallel veins.
Other Ways to Classify
Leaves
 Leaf shape (blade)
 Kind of edge (margin) on the leaf
 Kind of attachment to the stem (petiole)
 Venation: Palmate, pinnate, and parallel