Why do leaves turn green in spring?

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.