The Cause Of The Leaves Changing Colour
if we see a group of trees in the summer, then we will only see one colour only, i.e, the colour green. of course. there are different types of green colour green, but basically it's one only.
the colour of trees as if it were given paint equally, but when autumn arrives, the leaves it obtained a versatile range of colours, question : referrers all sorts of colours in autumn when it?
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| change colour of leaf in autumn |
as we know, the colour green on the leaves caused by the presence of chlorophyll, chlorophyll is the most complete food factory that is found in the leaves, two thirds of this leaf colour (the original pigment) is caused by the chlorophyll.
there are also other colours in the leaves, but due to the abundance of chlorophyll in outrageously, compare the original colour of the leaves, then the other colours that are not visible.
what kinds of other colours it? there is a substance called "xanthofil" that consists of carbon, hydrogen, and oxygen, the colour is yellow. roughly 23 percent of the pigmentation of the leaves are composed of these substances, carotene, i.e. a substance that gives colour to the roots of carrots or yellow, are also found in the leaves and amount to approximately 10 percent of pigmentation. the other is the pigment anthocyanin, which gives it a bright red colour to the apples and red oak.
during the summer months all other colours it is invisible, we see the green chlorophyll is simply that. if temperatures become cooler, food stored in leaves was beginning to flow into the trunk and branches of a tree.
because there is no longer any food that needs to be generated during the winter, then the chlorophyll factory undergo a period of rest and that chlorophyll substances undergo disintegration, because the substance chlorophyll disappeared, then other pigments-pigments that had been in the leaves that appear more visible again, which is why leaves appear colourful paced type as which can enjoy in autumn it.
before the leaves fall, it has already formed a solidified layers of cells at the base of the leaf stalk. so, when the wind blows, then leaves it will be compelled, and loss. but there is a kind of scratches on a branch that is a symbol from the former position of each leaf it.
but the majority of tree species that has always green like a fir tree suffered no loss on its leaves towards the winter, evergreen trees still green, the leaves loss as well. but through the usual way, i.e. gradually throughout the year.
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