Why Iron Tree is a Living Fossil 10

Because he is alive and has been around for many years.

1. Ginkgo, ginkgo tree is also known as white fruit tree, also known as duck's foot tree or Gongsun tree in ancient times. More than 270 million years ago, the ancestors of ginkgo biloba began to appear, and it was still a higher plant compared to the ferns that were all over the world at that time. More than 170 million years ago, ginkgo biloba has been spread all over the world like the dinosaurs that dominated the world at that time, and later, most of the ginkgo biloba became extinct like dinosaurs, and only a little bit was preserved in some parts of our country, and it has been passed down to the present and become a rare treasure.

2. Metasequoia, metasequoia is a deciduous and coniferous tree. It is one of the rare and precious plants in ancient times, and is a first-class protected plant in China.

3. Ginkgo biloba is the oldest relict plant among the existing seed plants in the world, and it is a special tree species in China and is known as a "living fossil". In addition, silver fir and metasequoia are produced in the Permian; Alder, grate and tricuspid cedar flourished in the Mesozoic; The dove tree and the incense tree are relict tree species of the Tertiary period, and these plants are called living fossils.

Ginkgo biloba is a tree with a special style, the leaves are green in summer and yellow in autumn, like an open folding fan, and the shape is unique and beautiful.

200 million years ago, Ginkgo biloba grew everywhere in Eurasia, the oldest tree species in the world. Later, more than 2 million years ago, the Quaternary glaciers appeared, destroying most of the ginkgo biloba, and the remains became plant fossils imprinted in stone. In this catastrophe, only a part of the living ginkgo trees in our country have been preserved, which have continued to this day and have become living teaching materials for the study of ancient ginkgo.

Therefore, ginkgo biloba is the oldest relict plant in the world, and people call it "the world's first living fossil". ”

China is the earliest country in the world to artificially cultivate ginkgo, in 1265 A.D. in the Southern Song Dynasty Chen Jingyi's "Quanfang Beizu", there is a record of ginkgo, earlier than other countries in the world. Ginkgo biloba is a rare longevity tree, many places in our country have found ginkgo trees, especially around some ancient temples and temples, you can often see the big trees planted for hundreds of years and more than a thousand years. Like the famous Huanglong Three Treasure Trees of Huanglong Temple in Lushan, one of them is ginkgo, with a diameter of nearly 2 meters, and the ginkgo of Tantuo Temple in Beijing is more than 1,000 years old.

And the world's longest-lived ginkgo, should also count the big ginkgo in Dinglin Temple in Ju County, Shandong Province, China, the tree is 24 7 meters high, the chest circumference is 15 7 meters, the canopy shade is 200 square meters, it is said that it was planted in the Shang Dynasty, and the natural ginkgo forest can also be found from now on, which proves that our country is the hometown of ginkgo.

Ginkgo biloba trees were introduced to Europe and the United States more than 200 years ago, and many famous botanical gardens are proud to be able to plant ginkgo, the "world's first living fossil".

Ginkgo biloba is the only surviving species of gymnosperms in the Ginkgo family, dioecious. According to the characteristics of ginkgo biloba, such as branch and leaf morphology and fan-like leaf veins, it is different from other more evolved gymnosperms, and is the oldest genus of existing seed plants. When its seeds are ripe, they are orange and yellow like apricots, the outer seed coat is very thick, and the middle seed coat is white and hard, so it is also called "white fruit".

The kernel of ginkgo biloba seeds can be used for medicinal purposes, and has the effects of moisturizing the lungs, relieving cough and strengthening the lungs. Its branches and leaves contain anti-insect toxins, which can prevent insects, so some people put a ginkgo biloba leaf in the book to get rid of the book silverfish. Ginkgo biloba also contains a chemical called ginkgo flavonoids, which can lower cholesterol, improve blood circulation in cerebral blood vessels, and have the effect of preventing and treating cerebral arteriosclerosis and thrombosis.

Therefore, Ginkgo biloba extract is a new group of cardiovascular and cerebrovascular health care drugs in the world, especially in the European and American markets.

Ginkgo biloba is the oldest relict of the existing seed plants. All other plants of the same class are extinct and are known as living fossils.

There are still surviving individuals such as dove tree, metasequoia, alder, ginkgo, etc., but they are also found in fossils.

Ginkgo biloba, silver fir, dove tree, fragrant fruit tree, etc.