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Thinking like a scientist
we are able to figure out
the names of many kinds of plants
in our yards by observing the shape...
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Alternate Leaves
Compound Leaf
Leaflets
Opposite Leaves
Lobed
Toothed
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Maple
Black Walnut
OAK
Red Maple
Weeping
Willow
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Pine
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Cherry
Spruce
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White Pine
Holly
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Dutch Elm
Hemlock
Ginkgo
Honey Locust
Horse
Chestnut
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Hibiscus
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Pear
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Why do the leaves change color?
Think about it, then write down
your ideas in your science journal.
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I always enjoy watching leaves turn from
green to red, yellow, orange, and brown.
How does it all work? Any ideas yet?
Keep Writing and Thinking!!!
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During the early spring and summer,
plants in our area get a lot of water
through the roots.
This water renews the chlorophyll (green pigment)
inside the leaves of the trees. Other colors, which
have been there all along become visible!
A fall with cloudy days
and warm nights
brings drab colors.
The color of the leaves
fade as fall turns to winter,
and the stems that secure them
to the branches
begin to loosen
with the change in weather.
The variations in the color
are determined by weather conditions.
And an early frost quickly
ends the colorful display.
The brightest colors are seen
when late summer is dry,
and autumn has bright sunny days
and cool (low 40's Fahrenheit) nights.
Then trees make a lot of
anthocyanin pigments
(bright red and purple).
What do
autumn leaves
and
ripening bananas
have in common?
The green color in
unripe bananas
comes from
chlorophyll, the same pigment
that gives green leaves their color.
As bananas ripen, the chlorophyll
breaks down and disappears,
leaving the yellow
yellow color
color
which has been there all along.
The yellows and oranges
of autumn leaves are also visible
as their chlorophyll
breaks down.