Write a mysterious composition of 350 words about the plant kingdom.

1. Write 350 words about the secret of a plant. I praise the faithful pine and cypress, the hedgehog fighting against the west wind, and the proud sludge of lotus, but I praise the proud snowflake of plum blossom.

When flowers fade, only plum blossoms are full of vitality. Facing the snowflake flying all over the sky, it stands proudly in the cold wind. It is freezing in the middle of winter, and the plum blossoms proudly blooming in the snow are so fresh and refreshing.

White flowers are red, and the petals are smooth and transparent, carved like platinum or jasper, which is somewhat elegant and pure. Some are as bright as the morning glow, some are as white as snow, and some are as green as jasper. Plum blossoms bloom sooner or later, and you can see all kinds of flowers on the same plum tree. Some shy, pink buds are fresh and lovely. Some just bloomed, and a few little bees got in and greedily sucked pollen; Some bloom for a long time, and the pink petals make people love; Plum blossoms, which used to bloom, now have withered petals. The wind blew the flowers down, so you don't have to worry about them breaking. Plum blossoms are not delicate flowers, but the colder they are, the more energetic and delicate they are. There is a saying in the ancients: "The sword front comes from sharpening, and the plum blossom fragrance comes from bitter cold." It is not the gentle spring breeze that blows it, but the cold wind that blows it. It is not the cool and sweet rain that moistens it, but the cold ice and snow; It is not the bright sunshine that shines on it, but a ray of setting sun in the cold. Only a challenging life is a good life. It was a proud fragrance in the cold, and she smiled more brightly in the face of dancing snowflakes. It never competes with flowers for bright spring, nor does it show off its beauty. It has a pair of pride and is never arrogant. Every winter morning, it has a unique charm and elegant fragrance.

It is not only elegant and elegant, so that poets and painters in ancient and modern times are amazed, but also regarded as the essence of the nation with its ice muscle jade bone and Lingling Liuxiang. Plum blossom, with its noble, strong and modest character, gives people the motivation to work hard.

The color of plum blossoms is gorgeous but not demon. The fragrance of plum blossoms is elegant. Meihua's posture is ancient and exquisite. Isn't this our construction worker? Whether the weather is cold or hot, whether it is windy or rainy, whether it is cold or freezing, they all work hard in their jobs.

2. The composition of the mystery of the plant kingdom 300 There are many kinds of plants, so there must be various ways to spread seeds! Some are spread by water, some by wind, and some are sprayed by themselves without the help of others. ...

Wetlands are spread by water. Its seeds began a long journey before we knew it. Its "skin" gradually cracked, revealing the bud like a steamed stuffed bun. Suddenly it began to rain, and a drop of rain fell on the "steamed stuffed bun", and the "stuffing" of the steamed stuffed bun came out-measuring the seeds of the Wetland Star. The teacher smiled and said, "It seems that this steamed stuffed bun has too much stuffing!" " "We all laugh.

Dandelion petals fall, and white fluff balls grow on the receptacle, some like little angels, some like brides in white wedding dresses, and pieces like snowflakes falling from the sky. Really beautiful!

Spray the melon yourself. Its fruit is like cucumber, and there will be viscous liquid inside the fruit when it matures. More and more liquid, and finally filled with fruit. As soon as you touch it, it will explode with a bang, just like a ball with plenty of air is suddenly punctured. So its seeds can shoot more than ten meters away! He is really a grumpy guy.

Plants have many secrets, just waiting for us to discover them. We should be good at observing them!

3. Mysterious students of the plant kingdom, do you know Nepenthes? Let me introduce you.

Nepenthes is a famous tropical insect-eating plant, mainly produced in tropical Asia. Nepenthes has a unique organ that absorbs nutrients-insect trap. The insect trap is cylindrical, and the lower part is slightly enlarged. Because it looks like Nepenthes, it is called Nepenthes. Hainan, the origin of China, is also called Leigong pot, which means like a hip flask. This kind of plant is called an insect-eating plant. It does not directly absorb nutrients needed to sustain life from inorganic fields such as soil, but lives by catching small animals such as insects. About nature-water, air, mountains, rivers, microorganisms, plants, animals, the earth, the universe and so on. , all belong to the category of nature; The science of studying nature is natural science, including mathematics, physics, chemistry, biology, geography and other sciences, and the branches of these sciences are very complicated, such as: biological science can be divided into microbiology, botany and zoology; Then it can be divided into molecular biology, cytology, genetics, physiology and so on. The intersection of various disciplines will produce many branches, such as biochemistry, biophysics, molecular structure biology and so on.

man and nature

Nature gave birth to human beings, which shows that it respects human behavior. On the contrary, human beings should respect nature more. On the surface, people are born of their parents. In fact, only when nature has the photon information of human beings can human embryos absorb this photon information from nature and grow into adults, that is, parents. At the same time, nature has completed the excitation of dark matter in embryos. There are 45336 species of vertebrates in nature, including birds 1244 species and fish 3862 species. There are more than 3 million species of insects, and only 1 10,000 species have been confirmed. Nature is a kind of natural resources, so people and nature should respect each other, maintain the attitude of cherishing and caring, make proper use of nature and prevent its destruction, so that the living environment is beautiful and the natural resources are inexhaustible, just like the mother and son are close and harmonious.

Therefore, the richness of information about nature can only be described as vast, and its complexity is not described by 30 thousand words or a few people.

Natural classification

There are all kinds of creatures in nature, including plants, animals, bacteria and fungi. At the same time, nature is also a place containing various ecosystems!

The elements of nature are divided into light, darkness, water, fire, wind, thunder and earth, which means that nature controls the balance of these things.

In a small flowerpot on my balcony, there is a humble mimosa. Its leaves are oval, light as feathers and a little rough to the touch. These tiny stems are so fragile that a drop of water can bend them. When the wind blows, the mimosa swings with the wind, just like a girl dancing. Its flowers are in full bloom. Once, I accidentally met a mimosa, and its green leaves were immediately put away and its petiole fell off. I squatted down curiously and found that after a while, the leaves of mimosa opened again and the petiole changed back. At this time, a question came to my mind: Why do mimosa put away its leaves after being touched? I immediately moved out the extracurricular study materials, and after some careful searching, I found the answer: There was an enlarged organ at the base of the petiole of Mimosa, called "leaf pillow", which contained many parenchyma cells and was very sensitive to the outside world. Once it touches the leaves, * * * will immediately spread to the occipital lobe, at which time the cell fluid in parenchyma cells begins to flow to the intercellular space, which reduces the expansion ability of cells. It leads to the decrease of intercellular pressure in the lower part of the occipital lobe, and the phenomenon of leaf closure and petiole drooping occurs. After one or two minutes, the cell fluid gradually flows back to the leaf pillow, so the leaves return to their original appearance. The reason why Mimosa leaves appear the above phenomenon is the result of its long-term adaptation to the natural environment in the process of system development. Mimosa lives in tropical areas, where there are many storms. Therefore, in order to protect itself in the long-term harsh natural environment, whenever a storm comes, it immediately closes its leaves to protect itself from the storm, thus gradually forming this unique physiological phenomenon. I thank mimosa, which brings me curiosity. I will study hard and use this "key" to explore more knowledge and explore the mysteries of the plant kingdom.

5. The secret ingredient of Mimosa in the plant kingdom, Mimosa, also known as Shameful Grass, Drinking Grass and Ugly Grass, is a perennial herb of Mimosaceae, with tufts, barbs and inverted bristles. When leaves are touched, they close and droop, showing shame. The flowering period is 3- 10 month, and the fruiting period is 5-00 months.

Why are mimosa "shy"? The petiole base and compound leaf base of mimosa have an enlarged part, which is called leaf pillow. There are vascular bundles in the center of occipital lobe and many parenchyma cells around it.

In normal times, each cell is filled with enough water, thus expanding, making the leaf pillow upright, so the leaves stretch, but once subjected to * * *, the water contained in the leaf pillow cells will flow into the intercellular space, so the leaf pillow will be soft and the leaves will close and droop. Mimosa's hometown is in tropical America, where there are often storms. This "shy" characteristic of mimosa is very beneficial to protect itself from wind and rain. It is also like a shy girl standing at the window. When she meets a stranger, she immediately closes the window, which is quite interesting and ornamental.

The whole plant of Mimosa mimosa has little toxicity, and it is used as medicine to soothe the nerves. Fresh leaves can be mashed and applied externally to treat herpes zoster. Originated in tropical America, it is now widely distributed in tropical regions of the world and produced in Yunnan, Guangxi, Guangdong and other provinces in China. Mimosa is a perennial herb, but it is not as weak as ordinary herbs.

Its stem branches from the basal part, which is upright or inclined, about 20 to 50 cm high, all with long soft hair and sharp thorns. The leaf is palmately compound and consists of four pinna.

There are many small leaves on each feather, which is different from ordinary palmately compound leaves. There is an enlarged structure at the base of the total petiole, which is called "leaf pillow"

Stipules near the base of petiole. The flowers of mimosa are very special.

Its purplish red or pink flower ball is actually not a flower, but an inflorescence composed of many small flowers. If you carefully separate each small unit on the ball, you can see that each small unit has four divided petals, four long stamens and a pistil. It turns out that every small unit is its flower.

After the flowers of mimosa are in full bloom, most of them will form pods, so the mimosa fruits we see are also densely spherical. Each pod has three or four nodes and the surface is hairy.

When the pod matures, it falls off from one section to another, leaving only the empty shelf formed between the sections, which looks very interesting. If you touch it gently, its open pinnate compound leaves will close immediately, and then the whole leaf will hang down again, showing a "shy" appearance, hence the name mimosa.

Why do mimosa droop when we touch it intentionally or unintentionally? Mimosa, the phenomenon of closed leaves and drooping petioles, is not "shy", but a response of plants to * * * and vibration. This reaction is called nasal movement in biology, which is the result of cell tension changes after mimosa is exposed to the outside world.

It turns out that the leaves and petioles of mimosa have special structures. There is a relatively enlarged part on the petiole and leaflet base of compound leaves, which is called leaf pillow.

Leaf pillow is the most sensitive to * * *. Once it touches the leaves, * * * immediately spreads to the leaf pillow at the base of the petiole, causing two small leaves to close, and the contact force is strong, not only to the leaf pillow of the lobule, but also to the leaf pillow at the base of the petiole soon, and the whole petiole droops.

Why is this happening? This is because there is a large vascular bundle in the center of occipital bone, which is surrounded by parenchyma and has many intercellular spaces. When the vibration is transmitted to the occipital lobe, the cellular fluid in the parenchyma cells in the upper part of the occipital lobe is discharged into the intercellular space, which reduces the swelling pressure of the cells in the upper part of the occipital lobe, while the original swelling pressure is maintained in the lower intercellular space. As a result, the leaflets stand upright, the two leaflets are close together, and even the whole leaf hangs down.

It has been studied that mimosa leaves will close within 0.08 seconds after being subjected to * * * *. After * * *, the transmission speed is also very fast, and the highest speed reaches 10 cm per second.

* * *, after a short period of time, everything slowly returned to normal, the lobules unfolded again, and the petiole stood up. The recovery time is generally 5- 10 minutes.

But if we continue to tease and repeatedly tease its leaves, it will feel "bored" and no longer respond. This is because the continuous * * * makes the cell fluid in the occipital lobe cells lose, which can not be replenished in time.

This special skill of mimosa has its historical roots. Its hometown is Brazil in tropical South America, where there are often strong winds and heavy rains.

Whenever the first drop of rain hits the leaves, it immediately closes the leaves and hangs down the petiole to avoid the damage of the storm. This is an adaptation to changes in external environmental conditions.

In addition, the movement of mimosa can also be regarded as a way of self-defense. When the animal touched it lightly, it closed the leaves, and the animal dared not eat any more. Mimosa is not a native of Taiwan Province Province, but its hometown is far away in South America.

From a distance, it looks like a small tree in the picture, with its branches stretching out. It's even weirder when you look closely. The thin leaves on each branch have no veins! As long as you touch its branches, it will be wrapped shyly, just like a shy little girl.

If you touch its branches, it will droop immediately, as if it were suddenly broken by a strong wind, but when you look at it again a few minutes later, you will be surprised to find that the mimosa has stretched out its small body and restored its previous appearance, and the color of its leaves seems to be greener than before. One day, I found a small pink flower like a fluffy ball growing next to the leaves of a mimosa. I wanted to feel what it was like, but I didn't expect to turn it off. It looks like a cute little thing that people don't want to touch.

I'll tell you a little secret: mimosa will grow faster after listening to music. What a wonderful plant! However, here it is.

There are infinite mysteries in the plant kingdom of about 200 words. Please choose one or two plants. There is a mimosa in my home. I am very concerned about its growth and go to see it every day. It has green spikes and pink hairy flowers. It is very beautiful. When you touch its leaves, it looks like a shy girl, with her head down and her leaves closed. You know that. Let me tell you something. The petiole base of mimosa has an enlarged part called "leaf pillow". There are parenchyma cells in the occipital lobe. When the leaves are touched by the outside world, the vibration will be transmitted to the leaf pillow. At this time, the water in parenchyma cells immediately flows to the intercellular space, thus reducing the expansion ability of cells. The leaves close automatically, and the petiole and branchlets droop at the same time. After a few minutes of "calm", they recovered. I quickly withdrew my hand, closed the window and went to do my homework. The next day, I stayed on the balcony and read. The sky is cloudy and it's going to rain. Inadvertently opened the window and found that the leaves of mimosa were still closed and did not look up. I was surprised: I didn't see anything touch it. How do its leaves close? It began to rain cats and dogs, so I had to close the window and watch TV. I waited and waited until a rainy day. I hurried home and rushed to the window sill with my schoolbag on my back. Ha, there is still a leaf not closed. I watched patiently and intently. After a while, a bug unconsciously bumped into the mimosa and flew away. At this moment, something wonderful happened. My heart suddenly enlightened. I opened the book and proved my guess. It turned out that before the rain, the air humidity was high, and some insects couldn't control themselves and hit the mimosa, causing the mimosa leaves to close. I am very happy, because I have solved the secret of mimosa leaves. With its "weather forecast", I won't get wet.

I like plants. There are infinite mysteries in the plant kingdom. Please choose one or two plants. The young cactus is a strange tropical plant with strong vitality. The indomitable character of potted cactus is surprising. It doesn't care if there is water, it's hot and cold. Its green body has palmlike stems full of thorns, so it won't grow up all the time. Like a pyramid, a "green hand" grows in a "green palm", which makes people have a lot of reverie. It grows everywhere in this posture. In the hot and long-term dry summer, other potted plants bowed their heads, while cacti looked up at the blue sky like soldiers. In the severe winter, other potted plants have already been taken indoors by their owners, but the cactus has weathered and is not afraid of the surrounding environment. It never pays attention to it. It takes root all its life, as if to say, "This place is really good, let's grow here!" " The immortal is covered with hard thorns, and any wild animal will stop at once when it sees it. Pests want to bite it, and their bodies are always full of holes. As soon as the green cactus came out of the ground, everyone thought it was dead. No, if you do this, it's wrong. It uses its own nutrients to grow roots and cultivate a young cactus, which really takes root. Who can match its tenacious vitality? This seemingly ordinary plant, who would have expected, will produce beautiful flowers, just like colorful tassels on a samurai helmet. Cactus is a tropical plant, shaped like a palm, hence its name. It is not afraid of heat, that is, the temperature is as high as 40 degrees Celsius, and it can survive tenaciously for several days without drinking water. In this way, it will stand the test of the hot sun day and night and grow happily. People should also have this indomitable scene.

8. The mystery of sunflower Speaking of my favorite flower, of course, it is sunflower.

Because sunflowers are beautiful and golden, and the disk looks like the sun. If you go to a sunflower field, it's like being in a peanut field. My relative has a sunflower. It is like a slim girl, standing tall and straight in the mud, attracting many people from the past to watch, and it is more vibrant under the sunshine.

But this striking "girl" also left many questions for people. One day, I visited a relative's house and occasionally saw this sunflower facing the sun! I was surprised, so I asked my uncle, and he couldn't tell the details.

It suddenly occurred to me that I have a copy of "100,000 Why" at home. I hurried home at once, tossing and turning this book "100,000 Why", and finally found the answer.

It turns out that the distribution of auxin on sunflower disk is uneven, and the concentration of auxin on the sunny side is low, so the growth is slow; The auxin concentration on the backlight side is high and grows faster, so the stem has phototropical bending. Later, scientists found that the sun's heat can shrink the fibers on the sunflower disk, so that the sunflower can actively change direction to receive light and heat, so the sunflower always faces the sun.

In addition, I know that sunflowers are made up of hundreds of small flowers. After the flowers wither in autumn, every small flower can form a sunflower seed.

It seems that there are many mysteries in the plant kingdom! We humans should take active actions to protect plants, unveil the mystery of the plant kingdom, and stop cutting down trees and trampling on grasslands, so that the world will be better.