Ginkgo Expo

Everyone must have been exposed to composition, especially as an expository article in a common style. The purpose of expository writing is to tell the reader something or something. How to write an explanatory article to highlight the key points? The following is a description of Ginkgo biloba that I collected for you. Welcome to read the collection.

Ginkgo biloba illustration 1 Ginkgo biloba

Ginkgo biloba has a very old and long history. As early as 270 million years ago, it appeared on our planet. About 65438+ billion years later, Ginkgo reached its peak. Large tracts of ginkgo forests are found almost all over the world, as common as dinosaurs living in the same era. Therefore, people also call it a dinosaur in the plant kingdom. But in later years, Ginkgo biloba, like many great empires, gradually lost its dominant position from prosperity to decline. In the tertiary period, the climate on the earth has undergone earth-shaking changes, and the mountains are constantly rising. In the competition with new flora, Ginkgo biloba was forced to withdraw from the historical stage of biology. Only in a few areas, protected by the unique geographical environment, a small number of ginkgo biloba survived, which became a rare thing in the plant kingdom and a living fossil of plants in the minds of scientists.

Compared with other plants, Ginkgo biloba grows very slowly. In general, it takes l5-20 years to plant its seedlings, and some even take 3040 years. As the saying goes, my father-in-law planted trees and my grandson ate fruits, so people gave it an image nickname Gongsun Tree.

With such a slow growth rate and such a late fruiting age, there must be a long life to adapt. That's right. Ginkgo biloba is indeed a typical long-lived tree species. The oldest ginkgo tree found at present grows in Ding Lin Temple on the northern slope of Shandong Fulai Mountain. It is said that it is over 3,000 years old, and it is still full of fruits today.

So, why can ginkgo live so long?

Botanists found in their research that all long-lived ancient ginkgo biloba have extremely developed roots, which are conducive to resisting various adverse environments in the depths of the ground. In addition, because ginkgo grows slowly and needs less nutrients, it is entirely possible to live in one place for hundreds or even thousands of years. Another reason for ginkgo's longevity is that there are few pests and diseases. This is because there is a substance called vinyl aldehyde and a variety of organic acids in Ginkgo biloba, which has strong antibacterial and insecticidal effects, so Ginkgo biloba is rarely attacked by pests and diseases.

Ginkgo biloba not only has scientific research value, but also has great economic use. Its fruit is called Ginkgo biloba, and its flesh is soft, smooth and fragrant. It is made into candy or other food, which is delicious and nutritious. Ginkgo biloba can also play an important role in gardens. Because it has special resistance to many kinds of diseases and insect pests and can resist the pollution of black smoke, dust and toxic gases in the city, it has some advantages over other plants as a street tree in the city. Ginkgo biloba leaves are unique in shape and turn orange in autumn, which is very delicate and lovely and has high ornamental value.

(The author's anonymous article has been deleted)

1. Can the words added in the following sentences be deleted? Why? (3 points)

About 65438+ billion years later, Ginkgo reached its peak.

2. Why do people call Ginkgo biloba a dinosaur in the plant kingdom? (4 points)

3. The underlined sentences in the text are explained by _ _ _ _ _ _ _ _ _.

Its function is. (4 points)

Please summarize the reasons for the longevity of ginkgo trees. (4 points)

5. Why should ginkgo trees be street trees? If you were asked to choose street trees for the roads in your hometown, what kind of trees would you choose (except ginkgo trees)? Please provide a justification for the answer. (5 points)

Answer:

1 ... cannot be deleted. (1) is an approximate value, indicating an estimate, while ginkgo trees have a long history and cannot be accurately calculated, so they can only be said to be approximate values. The use of approximation reflects the accuracy of explanatory language. (2 points)

2. Ginkgo biloba has a long history, (2 points) is as common as dinosaurs living at the same time. (2 points)

3. Column number, (1 min) and example (1 min). Accurately and concretely explain that ginkgo tree is really a long-lived tree species. (2 points)

4. Have a developed root system; Slow growth; Need less nutrition; Rarely attacked by sick pests. (65438+ 0 point per point)

5. The first question: (3 points) It is resistant to pests and diseases, pollution and strong ornamental. Question 2: (2 points) Write a tree name, which conforms to the characteristics of the tree.

Ginkgo biloba 2 Ginkgo biloba, commonly known as ginkgo tree and Gongsun tree, first appeared 300-400 million years ago and is a very old tree species. Later, the earth suddenly became cold, and most of the ginkgo biloba was extinct. It's just that our superior natural conditions in China have miraculously preserved this species. Jiangsu, where Taizhou is located, is located in the middle and lower reaches of the Yangtze River with a mild climate, which is an ideal place for the growth of ginkgo trees, especially Taizhou, which is very obvious.

Ginkgo biloba leaves are beautiful and change with the seasons. Every season presents different colors, and each color is very attractive.

In spring, the ginkgo tree sticks out a little green head. They danced in the breeze; In the sun, they shine with the brilliance of life.

In summer, the wind is sunny, and the fan-shaped leaves make rustling sounds, like experienced drummers and wind chimes with beautiful notes. The leaves are so green and bright, it seems that oil will flow out at a touch.

In autumn, "butterfly" flies down from the tree and lies beside the roots. They slept so comfortably that they seemed to have returned to their native land; They danced with the wind one by one, as if reciting a newly created poem: "Red leaves floating in the autumn wind dance on the stage like autumn". This scene is like a picture scroll. Whenever we see this painting, people can't help admiring the great painter nature.

There are almost no leaves on ginkgo trees in winter, which is particularly desolate. But there are always a few "tenacious" leaves on it, which are extremely tragic.

The fruit of ginkgo tree is commonly known as "Ginkgo biloba". Ginkgo biloba is delicious and nutritious. I prefer to eat fried in the microwave oven. When the sound of "Zizi" came to my ears, I was satisfied although I didn't eat it.

I like ginkgo tree, like its leaves, like its fruits, like everything about it!

On the west side of the school playground, there is a row of tall ginkgo trees standing upright, guarding the campus like guards, which is particularly eye-catching.

In spring, ginkgo trees spit out green leaves, small and tender, like a small fan. Looking at the ginkgo tree from a distance is like a fairy in green dancing in the spring breeze. Miss Chun dressed it beautifully.

In summer, ginkgo trees are lush, and the green leaves block the summer heat for us. Standing in the shade, a breeze is really cool!

Autumn is coming, and the fruit turns from cyan to pale yellow. When ripe, the fruit turns white and hangs on the branches one by one, so it is called ginkgo. Ginkgo biloba shell is hard, not too thick, which can protect the pulp inside. The flesh is light yellow, like lotus seeds. The soup in the ginkgo pot can strengthen the body. The leaves turn yellow gradually, and handfuls of small golden fans fall with the wind, paving a golden avenue. When school is over, the students walk on the avenue, not to mention how happy they are!

In winter, the leaves slowly fall out, leaving only the bare trunk, standing there alone. After a winter, the fallen leaves turn into mud to prepare for the growth in the coming year.

Are the ginkgo trees on campus beautiful? Come and visit our school!

In front of the teaching building of our school, there is a tall and straight tree, which is higher than the roof and stands beside the teaching building.

Now, I will introduce myself to it. It was called Gongsun Tree in ancient times, also known as Ginkgo Tree. In modern times, we call it ginkgo tree, which is a very precious tree species. It is the only surviving tree species of Ginkgo biloba because it is called a living fossil. Ginkgo trees have a long life. It has a special personality and strong physique, and is deeply loved and favored by the world.

In the spring of March, a hundred flowers blossom, and ginkgo trees are not to be outdone. Tiny buds sticking out from the branches, flashing yellow-green eyes, covered the ginkgo tree with a layer of green yarn. The breeze blew, blinked and rustled, just like a beautiful symphony echoing in the campus.

I haven't finished listening to this wonderful music. Unconsciously, the hot summer is coming, the young leaves have turned into small green fans, and the ginkgo tree has opened a huge green velvet umbrella, and the dense fan leaves cover the sky. It is cool and pleasant under the tree. My classmates and I often read books, play chess and games under the tree ... When we entered the school early in the morning, we heard birds chirping in the tree, sometimes tactfully and sometimes passionately.

Fan sent away the hot summer and ushered in the cool autumn. The small green fan gradually turned yellow, and a gust of wind blew, leaving a golden leaf on a tree. The autumn wind blew fiercely, and pieces of yellow fans whirled down from the branches and danced like butterflies, laying a "golden carpet" on the ground.

Slowly, the cold winter has come again, and one leaf after another has fallen to the ground, leaving only a few leaves with strong willpower rustling in the north wind. Bare branches stand on the ground, and after a burst of heavy snow, they are wrapped in silver and very spectacular.

Ah, ginkgo tree, you are so beautiful. I like you.

Ginkgo biloba, also known as Gongsun Tree, is the longest-lived tree species among fruit trees. There is one in front of my house. Its trunk is thick and tall, and its branches and leaves are particularly lush. Its leaves are like a delicate little fan. Ginkgo biloba is a dioecious plant, both sexes are planted on short branches. Most of these short branches germinate and grow from the buds in the middle and lower parts of long branches. The growth of this short branch takes 2-3 years, and more than 5-6 leaves can form flower buds. The top of the short branch is a large mixed bud, and the short fruit has a strong ability to bear fruit continuously, which can generally reach about 25 years. Short branches over 30 years old still have the ability to bear fruit, but short branches over 3 years old and below 15 years old have the best ability to bear fruit, and begin to weaken after 15 years old.

The extension ability of fruit branches is very weak, the annual growth is only 0.2 ~ 0.3 cm, but after stimulating the central growth point, branches can also grow; After the terminal buds of short branches are damaged or dead, dormant buds on short branches can germinate to form new short branches.

On a long branch, several short branches can be formed in the same year, and their growth, fruiting ability and weakening time are the same except for the same age. Therefore, pruning is not necessary before the senescence of short branches, that is, when the fruiting ability of short branches decreases and needs to be updated, it is not necessary to update and prune each short branch one by one, just update the branches of the same age. This is the uniqueness of Ginkgo biloba from other fruit trees. It can be seen that ginkgo tree has stable fruiting branches, small growth, strong continuous fruiting ability, easy cultivation and easy drying up.

Ginkgo biloba has almost no developing branches and is not as sensitive to pruning as apples and pears. Long branches can naturally produce short branches, so pruning is simpler. Pruning is mainly to cultivate backbone branches, allocate and adjust the result branches, straighten out the subordinate relationship and adjust the balanced growth of branches.

The short fruiting branches of Ginkgo biloba are germinated from the buds on the long branches. Therefore, the stronger the long branches grow, the more short branches germinate and the better the results will be. Therefore, attention should be paid to selecting and retaining long branches when pruning; The hidden buds of ginkgo trees have a long life and are easy to shade, and they are easy to blossom and bear fruit after germination. Therefore, it is also very convenient to update ginkgo trees. Inside the crown, under the main branch, it is not easy to be bald. This is also the particularity of ginkgo trees.

There is a tall ginkgo tree in my yard, which is as high as seven stories.

In spring, the ginkgo tree sprouted, and I thought, "When will the ginkgo tree grow new leaves?" I will never forget this tall ginkgo tree.

When summer comes, ginkgo trees grow many green leaves, ah! I waited for a long time and finally saw the green ginkgo tree. How nice!

Autumn has come, and ginkgo trees are golden, like golden apples full of trees. Ginkgo leaves fall everywhere, some on the house, some on the car … I put them in a bag, so that even if they are cut down, I will always remember them.

In winter, only the trunk, branches and roots of ginkgo trees are left. I think it's like a strong guard standing there, guarding the yard and giving us a sense of security.

I like this ginkgo tree because it will bring us many benefits. Now we should not only cherish this tree, but also plant more trees!

Ginkgo biloba shows that the green in spring and summer in July is flawless, and the yellow in autumn is flying all over the sky. The leaves look like small fans and duck feet. I think everyone guessed. Ha ha! That's right. I want to introduce ginkgo biloba, the offspring of an unaccompanied gymnosperm.

Ginkgo biloba originated in East Asia and is one of the famous ancient and famous trees in China. Its cultivation history is very long, and ancient trees over a thousand years can be seen everywhere. In the eyes of ancient monks, ginkgo represents longevity, elegance and sacredness, so it is often planted in temples and is regarded as a "sacred tree".

Strange! Why is Ginkgo biloba called Ginkgo biloba? At first, Ginkgo biloba was a folk fruit tree. Although it does not bear fruit, it has a fleshy seed coat, just like an apricot. When it matures, it is covered with a layer of white powder, so it is called "Ginkgo biloba". After removing the fleshy seed coat, you can see that the white seed coat is as hard as almonds. You can eat delicious "nuts" if you break them. Therefore, people also call Ginkgo biloba "Ginkgo biloba".

Modern scientists have proved that Ginkgo biloba is the oldest existing tree species on the earth, and its ancestors lived in 2. It appeared 700 million years ago. During the Mesozoic era, the Ginkgo family was extremely prosperous, not only in a wide variety, but also distributed almost all over the world. Later, due to the changes of the earth's climate and geology, the Ginkgo family began to decline gradually. About 2 million years ago, the family suffered a devastating blow, leaving only ginkgo biloba in parts of East Asia. Therefore, Ginkgo biloba becomes an unaccompanied plant in gymnosperms.

Nowadays, it is gratifying that Ginkgo biloba has attracted people's attention all over the world and is known as the "golden fossil tree", which is widely planted in gardens.

Ginkgo Commentary 8 Last spring, I planted a seed of hope and looked forward to the ginkgo tree every day.

It was another winter in a blink of an eye. I went downstairs to see if the seeds had sprouted. Rows of ginkgo trees stand in the community and go straight into the sky. I looked everywhere, but I couldn't find the ginkgo tree I planted. I thought it might be dead, so I went back upstairs.

Just the day before yesterday, I strolled in the garden of the community, but I accidentally saw my own ginkgo. Look, it has grown into a small sapling. The green leaves are full of vitality, as if they were about to escape from the garden at any time. The slender trunk is swaying, as if it will break when the wind blows.

As soon as I finished breakfast yesterday, I rushed downstairs in three steps and ran to the flower bed to see my little ginkgo tree at the speed of 100 meters race. What I never expected was that I grew a lot overnight. The sun rises slowly, and the sun shines all over the earth, and the grass dances; Flowers are competing to open, trying to compare high and low; And my little ginkgo tree, it greedily absorbs the sunshine and sucks the rain and dew. How fresh the air is and how sunny it is. Even I can't help wanting to dance with them. I just stayed with that little ginkgo tree and watched it grow.

As time went by, I looked up. This is already a bright starry sky, green like a leaf cloud outside. The moon is looking at me, and the stars in the sky are blinking naughtily. The water in the pond sparkled in the moonlight, and the whole pond turned silver. I looked down, and the whole garden was dark. I groped my way to a ginkgo tree and touched its thick trunk. I can't help thinking, "When will my small ginkgo grow like this?"

This morning, it was very cold, and I was afraid it would freeze, but as soon as I stepped into the flower bed, I saw: the delicate rose withered and fell to the ground, and the grass was listless and not far from death. I hurried to speed up my steps and came to it, only to see it hold its head high and straighten itself. My worry is unnecessary! I understand that when difficulties come, those who are afraid and can't do it can only wither, and those who persist will grow taller and stronger!

We are like plants in the garden. How can you see a rainbow without experiencing wind and rain?

I like ginkgo tree best, because it is my favorite tree.

I remember once in autumn, I watched the golden leaves of a tree shining in the sun and couldn't help but sigh: "Wow, this tree is really beautiful!" " "

On my way to school, there is a row of ginkgo trees. Rows of ginkgo trees are tall, with thick trunks standing upright. Don't think it's a bare tree. Its trunk is covered with many trunks, and the dense branches are surrounded by golden leaves, like a feather duster. Seen from a distance, it stands there like a giant. A section of the trunk on the ground is painted with lime, just like wearing white socks, which is both beautiful and moth-proof!

Late autumn is its most beautiful time. At this time, the leaves of the tree turned golden, and they formed a huge golden crown. Autumn wind blows, leaves fall from the branches, just like small paratroopers falling from the season, dancing like golden butterflies. The car passed by, and the leaves rolled with the wheels, like a race.

I picked up a leaf and observed it carefully. The leaves are very smooth, and a little vein is clearly visible, like fireworks set off on holidays. Petiole up, like a small sailboat! Smell it, and it's mixed with a faint fragrance.

Ginkgo tree is a beautiful scenery at any time. I love ginkgo trees!