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Free images related to Fall Note
on large files: Very large files may be bigger than your screen.
► Did you know.... that fall, or autumn, represents the transition from summer into winter. This occurs in September in the Northern Hemisphere and in March in the Southern Hemisphere.
Why
are the fall leaves of deciduous trees so colourful in the fall?
Let's first recall how leaves act as nature's food factories. Trees take water from the ground through their roots. They also collect a gas called carbon dioxide from the air. Trees then use sunlight to turn the water and carbon dioxide into oxygen and glucose. This is wonderful for humans, since we need the oxygen gas, known as air, to breathe! The glucose is a kind of sugar that the tree uses as food for energy and growing. The process of turning water and carbon dioxide into oxygen and glucose is called "photosynthesis". A
chemical named "chlorophyll" helps to make
photosynthesis occur. As fall approaches, trees begin to get ready for winter when there is not enough water or light for photosynthesis to continue. While during the summer's growing season, chlorophyll is being produced and broken down making the leaves appear green, in the fall however, the food factories end production and all the chlorophyll is destroyed. When the green pigment disappears, we now see the Carotenoids and Anthocyanins present in the leaves. Carotenoids
are present throughout the growing season. They produce
yellow, orange and brown colours in other things besides leaves as
well - corn, carrots, daffodils, etc. Most In
some trees, like the Maples, glucose is sometimes trapped in the
leaves. The cool nights of fall cause the glucose to turn
into a red colour. A dry fall season will result in dull,
pale colours, while a rainy season will increase the chance of
sharp, brilliant colours. Recap: When chlorophyll is no longer present, the carotenoids and anthocyanins are unmasked and we see the colours.
In
addition to the images below, please check out the Tree
Categories.
Autumn - 1 Medium - 640 x 480 Right click on above image and chose "save as". Large - 4608 x 3456 - For the full-size resolution of this image click here.
Autumn - 2 Medium - 640 x 480 Right click on above image and chose "save as". Large - 4608 x 3456 - For the full-size resolution of this image click here.
Autumn - 3 Medium - 640 x 480 Right click on above image and chose "save as". Large - 4608 x 3456 - For the full-size resolution of this image click here.
Autumn - 4 Medium - 640 x 480 Right click on above image and chose "save as". Large - 4608 x 3456 - For the full-size resolution of this image click here.
Autumn - 5 Medium - 640 x 480 Right click on above image and chose "save as". Large - 4608 x 3456 - For the full-size resolution of this image click here.
Fall - 1 Yellow Maple Trees Medium - 640 x 480 Right click on above image and chose "save as". Large - 3264 x 2448 - For the full-size resolution of this image click here.
Fall - 2 Yellow Maple Trees Medium - 640 x 480 Right click on above image and chose "save as". Large - 3264 x 2448 - For the full-size resolution of this image click here.
Fall - 3 Yellow Maple Trees Medium - 640 x 480 Right click on above image and chose "save as". Large - 3264 x 2448 - For the full-size resolution of this image click here.
Fall - 4 Yellow Maple Trees Medium - 640 x 480 Right click on above image and chose "save as". Large - 4608 x 3456 - For the full-size resolution of this image click here.
Fall - 5 Yellow Maple Trees Medium - 640 x 480 Right click on above image and chose "save as". Large - 4608 x 3456 - For the full-size resolution of this image click here.
Fall - 6 Towering Yellow Maple Trees Medium - 640 x 480 Right click on above image and chose "save as". Large - 4608 x 3456 - For the full-size resolution of this image click here.
Fall Image Pages [1] [2] [3] [4] [5] [6] [7] [8]
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The
leaves of plants contain colour three pigments: Cholorphyll,
Carotenoids and Anthocyanins. We'll discuss each of these in
turn.
It
is chlorophyll that gives plants their green colour.
Anthocyanins
are produced in the fall in response to bright light and excess
plant sugars in the leaves. Anthocyanins give colour to
things such as cranberries, blueberries, cherries, etc.
