The essay "Three Ginkgo Trees" (by Ye Shengtao) selected in the textbook describes the characteristics of ginkgo trees, such as "lovely flowers, delicious fruits and beautiful leaves". The article wrote:

This spring, I saw the flowers of ginkgo tree, which are lovely little flowers with a little yellow in the white;

Peeling off the shell and clothes is a kernel like an emerald. Although it is not sweet, it has a special clear taste, which we all like to eat.

The wind blew up the yellow leaves on the ground, and we clapped our hands and shouted, "A group of yellow butterflies are flying! “

So, why do people generally like ginkgo trees? Mainly because ginkgo trees have the following characteristics.

I. "Living Fossils" In the animal world, the panda in China is a "living fossil" animal, while in fruit trees, ginkgo trees are called "pandas in fruit trees". Ginkgo biloba, which appeared about 250-350 million years ago, is one of the oldest existing tree species in the world. It is praised as "the living fossil of the plant world" by the scientific community, and it is listed as an ancient and rare plant in the plant world together with Metasequoia glyptostroboides and Metasequoia glyptostroboides.

Second, unique tree species once spread all over the world, but now it has become a unique tree species in China. Because several glacial movements on the earth have wiped them out. About 500 thousand years ago, the climate on the earth suddenly became cold, and many glaciers occurred widely in high latitudes. Many plants could not stand the cold, and the fittest survived and the unsuitable perished. Ginkgo biloba, like many plants and animals, is almost extinct. However, the glaciers in China belong to intermittent glaciers, so ginkgo trees have been preserved in the "cracks" of some mountains in China.

Because the mountains in our country run from east to west, and the terrain is complex, it plays a role in blocking glaciers, and the climate is not so cold. North China and Central China are only affected by the local cold climate, so Ginkgo biloba in some places can survive and become a precious "living fossil". According to the investigation by scientists, there are still a few wild ginkgo trees in the deep canyon at an altitude of 400-1000 meters in West Tianmu Mountain, Zhejiang Province. Ginkgo trees in the world today are all introduced from China.

Third, the high value of ginkgo is a treasure. Its products have economic, ecological and social benefits. Ginkgo biloba is easy to breed and simple to cultivate; Less investment, more income. Some people regard ginkgo production as "smokeless industry", "green bank" and "the protector of human environment".

Ginkgo biloba fruit has high nutritional value and can be eaten raw, fried and cooked. Silver almond is one of the "eight-treasure rice".

Ginkgo fruit can be used as medicine.

Its wood is firm and meticulous, soft and light, and can be used as an excellent material for architecture, joinery, model industrial appliances, furniture and sculpture.

Ginkgo trees are also ornamental trees. In the hot summer, the leaves are lush and the sun is shaded; In late autumn, there are fruitful fruits and golden leaves. Ginkgo trees add infinite beauty to nature and bring endless fun to people's lives.

Fourth, the "longevity tree" ginkgo tree has a long life and is a veritable "longevity tree". There is an ancient ginkgo tree 1400 years old in Chang 'an County, Shaanxi Province. Ginkgo tree has a long life, which is related to its strong vitality. Its branches and leaves contain insect-resistant toxins, and it is not afraid of any pests. Ginkgo trees have a solid defense system. When germs invade the leaves, the cell walls of the leaves will thicken, thus forming an "iron wall", which makes the germs powerless. The hidden buds of Ginkgo biloba have a long life. The trunk and neck of a thousand-year-old fruit tree often sprout new branches. Ginkgo biloba is nothing new. There is a ginkgo tree in Hubei province, which was struck by lightning about 200 years ago. Its heartwood was partially burned and its trunk was split, but it is still alive. So far, it is over 800 years old.

Ginkgo trees have a long life, but they bear fruit late. It will take 20-30 years to blossom and bear fruit. Therefore, people call it "gongsunshu", which means that the tree planted by grandpa can't eat the fruit until the grandchildren.

Appendix:

Description: Students like ginkgo trees very much, and they often write about ginkgo trees in their compositions, expressing their affection. The two compositions selected below are written by primary school students, with careful observation and accurate description. For learning reference only.

1. Ginkgo tree

In spring, ginkgo trees grow dense buds, which are full of vitality under the moisture of sunshine and rain.

In summer, the green leaves are full of vitality on the crown with branches and buds. When the breeze blows, the leaves rustle, as if playing a beautiful symphony of nature. Dense branches and leaves cover the sun tightly, and the shade is always half the size of a basketball court. Look, we are singing heartily in the shade. If it rains, we only hear the sound of raindrops hitting the branches. Ginkgo trees are like a giant umbrella, which blocks us from ups and downs.

In autumn, its branches and leaves turn yellow and gradually fall down, as if a kind old man told us: "Autumn is coming, the weather is cold, so put on more clothes and be careful to catch cold."

In winter, the branches of ginkgo trees are bare and stand upright in the whistling north wind, so strong.

I really like this ginkgo tree. It adds fun to our childhood.

(Selected from Selected 500-word Composition of Primary School Students, published by Jilin Photography Publishing House 1999)

2. Beautiful ginkgo trees

The trunk of ginkgo tree is so thick that it takes two children my age to fold it. The bark feels rough and bumpy, much like grandma's wrinkled face.

Ginkgo tree leaves are very strange, fan-shaped. There are also small gaps on the edge of the leaves, big and small, and there are no rules. When the leaves are still green, they are not noticeable. The golden leaves of that tree after the autumn wind are really beautiful. A breeze blew, and the leaves of a tree fanned and fanned like a fan ... Fan away the summer heat, fanned and fragrant, and occasionally blew off a few yellow "butterflies" and danced in the wind. Whenever I see such beautiful scenery, I feel like I'm in a painting, and I can't get over it for a long time.

This time, among the green and yellow leaves, I also found the fruit of ginkgo tree. One by one is green, a bit like a gourd, with a big bottom and a small top. Grandma looked at me staring at the fruit on the tree, and smiled and told me that "the fruit of ginkgo tree is called ginkgo, and it will take many years for ginkgo tree to bear fruit." The taste of the fruit is bitter. You can eat it after frying it, or you can use it as medicine! " Hearing this, I quickly said: "I want to eat, too." Grandma said: "Well, silly child, wait a few days, the fruit is down, and grandma will fry it for you." I nodded again and again.

Ah, beautiful ginkgo tree, I don't know when you have entered my heart!

? (Selected from Classified Composition for Primary School Students, published by Guangdong Education Press in 20 14)