Changes of deciduous leaves throughout the year?

The leaves are green because there is chlorophyll in them. But in addition to green pigment, there are many pigments such as red pigment and yellow pigment in leaves, but the quantity is very small. In autumn, the green pigment gradually fades, and the red pigment and yellow pigment are exposed, making the forest golden or fiery red, which is very beautiful.

When autumn comes, the leaves in Shan Ye suddenly turn into beautiful colors. Why?

It turned out that in summer, Ye Ye worked hard, but as soon as the weather turned cold, she stopped working. Nutrients made by leaves cannot be sent to branches and trunks, but are deposited in leaves. Chlorophyll in leaves will also be destroyed, and it will be mixed with residual nutrients in leaves or withered dark brown, thus becoming various beautiful colors.

Why do the green leaves in autumn change color?

All leaves contain green chlorophyll. Trees use chlorophyll to capture light energy and store it in the form of chemicals such as sugar with the help of other substances in leaves. Besides chlorophyll, many leaves also contain other pigments, such as yellow, orange and red. Although these pigments can't carry out photosynthesis like chlorophyll, some of them can transfer the captured light energy to chlorophyll. In spring and summer, the content of chlorophyll in leaves is much richer than other pigments, so the leaves show the green color of chlorophyll, while the colors of other pigments are invisible.

When autumn comes, the days get shorter and the nights get longer, which makes the trees begin to shed their leaves. Before the leaves fall, trees no longer look for samples to produce a lot of chlorophyll as in spring and summer, and the existing pigments such as chlorophyll will gradually decompose. In this way, with the gradual reduction of chlorophyll content, the colors of other pigments will gradually appear on the leaves, so the leaves will show yellow, red and other colors.

Yellowing:

The leaves are green because there is chlorophyll in them. But in addition to green pigment, there are many pigments such as red pigment and yellow pigment in leaves, but the quantity is very small. In autumn, the green pigment gradually fades, and the red pigment and yellow pigment are exposed, making the forest golden or fiery red, which is very beautiful.

When autumn comes, the leaves in Shan Ye suddenly turn into beautiful colors. Why?

It turned out that in summer, Ye Ye worked hard, but as soon as the weather turned cold, she stopped working. Nutrients made by leaves cannot be sent to branches and trunks, but are deposited in leaves. Chlorophyll in leaves will also be destroyed, and it will be mixed with residual nutrients in leaves or withered dark brown, thus becoming various beautiful colors.

Why do the green leaves in autumn change color?

All leaves contain green chlorophyll. Trees use chlorophyll to capture light energy and store it in the form of chemicals such as sugar with the help of other substances in leaves. Besides chlorophyll, many leaves also contain other pigments, such as yellow, orange and red. Although these pigments can't carry out photosynthesis like chlorophyll, some of them can transfer the captured light energy to chlorophyll. In spring and summer, the content of chlorophyll in leaves is much richer than other pigments, so the leaves show the green color of chlorophyll, while the colors of other pigments are invisible.

When autumn comes, the days get shorter and the nights get longer, which makes the trees begin to shed their leaves. Before the leaves fall, trees no longer look for samples to produce a lot of chlorophyll as in spring and summer, and the existing pigments such as chlorophyll will gradually decompose. In this way, with the gradual reduction of chlorophyll content, the colors of other pigments will gradually appear on the leaves, so the leaves will show yellow, red and other colors.

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Fallen leaves:

Why do trees lose their leaves in autumn?

Because autumn means the coming of winter, trees need to sleep for self-protection, and hibernating trees themselves need nutrients. In order to adjust the internal balance, many trees need to shed leaves, reduce the loss of water and nutrients, and conserve energy until the conditions are suitable. And some trees, such as pine and cypress, can remain evergreen because their leaves are like needle tips, and there is little loss of water and nutrients.

People often use "autumn wind sweeping leaves" to describe autumn scenery in temperate regions. Autumn has come, and the leaves of broad-leaved trees such as poplar and locust tree are gradually aging. With the rustling autumn wind, the yellow leaves fall quietly. You may feel sorry for the fallen leaves, but have you ever thought that the fallen leaves are just the self-protection of trees?

It's cold, people put on stoves and cotton-padded clothes. But what about trees? They can only spend the winter safely by shedding all the leaves to minimize water transpiration. Otherwise, due to the freezing weather and whistling wind, it is difficult for the roots to absorb water, and the transpiration of the leaves will proceed as usual. Think about it, what is waiting for the trees besides death?

Petiole used to grow stiff on branches. In autumn, as the temperature drops, several layers of fragile parenchyma cells form at the base of petiole. Because these cells can be easily separated from each other, it is called stratification. After the separation layer is formed, it will break when a slight breeze blows, so the leaves will fall.

Leaves are broad-leaved trees in temperate regions, which is a skill to reduce transpiration and prepare for safe winter.