Power point on life cycle of a tree
It is important that students understand the biology of trees to further be aware of trees’ role in the ecosystem throughout
How to
Measure &itsIDlife.
Week 1 Day 3
Seedlin
g
Seed
Sapling
Snag
Mature
Oak
Like all living things trees have a life cycle:
Birth
Growth
Aging
Death
As trees grow, their physical form changes as does their role in the forest ecosystem
Which came first - the tree, or the seed?
Seeds come in a variety of shapes, weights, colors, and sizes, depending on the species.
Seeds develop from male and female parts of the trees producing fruits.
Some seeds are in a protective nut like an acorn
Others are in fleshy fruits, like the black cherry.
The fruit of a pine is a cone and the seed is winged and
resembles a miniature helicopter when falling.
Wind, water, animals, and people disperse seeds to the forest floor, open fields, yards and roadsides.
Where conditions are favorable for germination, seeds will germinate and grow.
The seedling grows and begins to develop woody characteristics.
The stems harden, change color, and develop a thin protective bark.
The stem may bend or develop branches that reach toward light.
Leaves or needles that develop are adapted to shade, but lean or tilt toward light. Most roots are in the upper soil to absorb water, nutrients and air.
Seedlings compete for nutrients, water, sunlight, and space.
Threats include fire, flood, drought, disease, insect attacks, and animals.
At this stage the tree is most susceptible to being killed.
When the tree is about 1-4 inches in diameter at 4.5 feet, it is considered a sapling. standard height where tree’s diameter is
measured – diameter at breast height (DBH).
As the tree starts to get taller the trunk thickens and branches develop.
A sapling is the size of a tree growing in a nursery. In this juvenile state, the tree is not mature enough to reproduce.
Growing rapidly, the sapling has the same competition and
How to
Measure &itsIDlife.
Week 1 Day 3
Seedlin
g
Seed
Sapling
Snag
Mature
Oak
Like all living things trees have a life cycle:
Birth
Growth
Aging
Death
As trees grow, their physical form changes as does their role in the forest ecosystem
Which came first - the tree, or the seed?
Seeds come in a variety of shapes, weights, colors, and sizes, depending on the species.
Seeds develop from male and female parts of the trees producing fruits.
Some seeds are in a protective nut like an acorn
Others are in fleshy fruits, like the black cherry.
The fruit of a pine is a cone and the seed is winged and
resembles a miniature helicopter when falling.
Wind, water, animals, and people disperse seeds to the forest floor, open fields, yards and roadsides.
Where conditions are favorable for germination, seeds will germinate and grow.
The seedling grows and begins to develop woody characteristics.
The stems harden, change color, and develop a thin protective bark.
The stem may bend or develop branches that reach toward light.
Leaves or needles that develop are adapted to shade, but lean or tilt toward light. Most roots are in the upper soil to absorb water, nutrients and air.
Seedlings compete for nutrients, water, sunlight, and space.
Threats include fire, flood, drought, disease, insect attacks, and animals.
At this stage the tree is most susceptible to being killed.
When the tree is about 1-4 inches in diameter at 4.5 feet, it is considered a sapling. standard height where tree’s diameter is
measured – diameter at breast height (DBH).
As the tree starts to get taller the trunk thickens and branches develop.
A sapling is the size of a tree growing in a nursery. In this juvenile state, the tree is not mature enough to reproduce.
Growing rapidly, the sapling has the same competition and