TREE ANATOMY
Megan Ketchum
Virginia Cooperative Extension
OBJECTIVES:
Learn structure and function of tree parts
| Identify key terms
| Understand the interaction of structure and
function in tree biology
| Hands-on twig identification
|
AGENDA:
|
Overview Tree Structure
Plant vs. Animal
y Tree Classifications
y How Trees Grow
y
|
Tree Parts
Crown: Leaves, Stems, Branches, Bark
y Trunk: Xylem, Phloem
y Root: Meristem, Root hair, Mycorrhizae
y
|
Key Concepts/Take Home Message
OVERVIEW TREE STRUCTURE
Plants vs. Animals
| What’s the difference?
|
TREE STRUCTURE
|
Why don’t
plants walk?
|
Who is more advanced a plant or animal?
TREE STRUCTURE
Gymnosperm vs. Angiosperm
| Bryophytes?
|
TREE STRUCTURE
|
Deciduous vs. Evergreen
TREE STRUCTURE
|
Monocot vs. Dicot
|
Bonus Questions:
Are pine trees monocots or
dicots?
y Do all dicots flower?
y If monocots don’t have wood
how do they support
themselves?
y
TREE STRUCTURE
|
Monoecious vs. Dioecious
WHAT MAKES A TREE A TREE?
Heights at least 4.5
meters (about 15 feet)
| Single dominant
woody stem (trunk or
bole)
| Capable of diameter
growth
| Perennial plant
(present at all seasons
of the year)
|
TREE STRUCTURE
TREE STRUCTURE OVERVIEW:
TREE STRUCTURE
Where do trees grow?
| How do trees grow?
| After growth what
happens?
|
TREE PARTS: LEAVES
|
Functions:
Photosynthesis
y Transpiration
y
LEAVES
LEAVES
LEAVES
|
Bonus Questions
|
Why do plants loose
their leaves?
LEAVES
BREAK TIME!!!!!
10 Minutes!
CROWN: STEM
CROWN: STEM
STEM
STEM/BRANCH
STEM /APICAL DOMINANCE
TREE FORM
Excurrent
| Decurrent
|
Do you see a connection between the habit of leaf loss and the
growth pattern?
BRANCH/TRUNK
BRANCH/TRUNK
|
How does compartmentalization work?
BRANCH/TRUNK
BRANCH/TRUNK
Branches and Bark Ridge
ROOTS
ROOTS
ROOTS
|
Mycorrhizae
KEY CONCEPTS/ TAKE HOME
MESSAGE
Autotrophs
| Photosynthesis
| Hormones
| Meristem
| Indeterminate growth
| Architectural design
| Trophism
| Allelopathic
|
THANK YOU FOR YOUR
TIME!!!