What changes have taken place in autumn?

First, fallen leaves

Generally, in autumn, most deciduous plants and trees begin to shed their leaves, and the leaves are yellow and curly, falling from the trees and dancing with the wind, which also means that after late autumn, winter is coming.

Second, geese fly south.

Every autumn, the cold climate in the north is no longer suitable for geese to survive, and they will fly to the warm south in droves. The next spring, after a long journey, they returned to the north to lay eggs and breed.

Third, fruitful results.

During the autumn harvest, all the fruits on the trees are ripe, such as apples, pears and persimmons. It is full of branches, which is a bumper harvest scene.

Fourth, the leaves turn red

It turns red because the leaves contain a lot of anthocyanins. Chloroplast, as the place of leaf photosynthesis, contains not only chlorophyll that makes leaves appear green, but also carotenoids that make leaves appear yellow. In summer, the chlorophyll content in leaves is high, so bright green overshadows yellow. As the temperature drops, the days become shorter and chlorophyll is decomposed in large quantities. At this time, other pigments such as carotenoids submerged in leaves will be exposed.

Verb (abbreviation for verb) frost

For example, in the autumn morning, sometimes you will see a thin layer of white things on the ground, that is, frost.