Once, I accidentally met a mimosa, and its leaves shrank immediately and its petiole fell off. What a shy little girl! I squatted down curiously. After a while, the leaves of the 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: It turns out that there is an enlarged organ called "leaf pillow" at the base of the petiole of mimosa, and there are many parenchyma cells in the leaf pillow, which is very sensitive to the outside world. Once it touches the leaves, * * * will immediately spread to the occipital bone. At this time, the cytosol in parenchyma cells began to flow into the intercellular space, which reduced the expansion ability of cells and led to the decrease of intercellular pressure in the lower occipital region, resulting in the phenomenon of closed leaves and drooping petioles. After a minute or two, the cell fluid gradually flows back to the leaf pillow, so the leaves return to their original appearance.
The reason why mimosa is like this is because mimosa lives in tropical areas where there are many storms. Therefore, in order to protect itself in the harsh natural environment for a long time, whenever a storm comes, it immediately closes its leaves to protect itself from the storm.
I thank mimosa, which brings me curiosity. I want to use this "key" to study hard, explore more knowledge and explore the mysteries of the plant kingdom.
I discovered the secret ingredient of mimosa. Nature is like a kaleidoscope. All kinds of strange natural phenomena will appear around us from time to time, but among the interesting question marks, what impressed me most is that I discovered the secret of mimosa's shyness.
Last year, my mother bought a pot of mimosa, which was very lush. I like it very much and find his name very interesting. Like me.
I wonder how it is afraid of shame.
Once, I touched its leaves lightly, and as a result, its leaves closed immediately. I was curious, so I touched other leaves with my hand, and it was the same. I stepped aside and stopped touching it. After a while, I didn't expect its leaves to spread slowly.
Moreover, I also found that in rainy and windy days, its leaves will also close.
"Why are the leaves of mimosa closed?" "Why is it closed in rainy and windy days?" "Are you really as shy as people?" I was puzzled and asked my mother with questions. My mother said, "Find the answer yourself.
"I went to check the information. After a long time, I finally found the reason: the leaves and petioles of mimosa contain a lot of water. Touch it with your hand, and the water on the leaves will flow to other places, so the leaves will roll up.
On the contrary, if you touch the petiole with your hand, the water below will go much more and the whole leaf will hang down.
In rainy days and strong winds, its leaves droop, which is its way of protecting itself from being broken by storms.
I suddenly realized that mimosa is not really shy! At this time, I am very excited, because I picked another small flower in the garden of science and caught a small fish in the ocean of knowledge, which I will never forget.
There are still many natural mysteries in the world waiting for us to uncover. When I grow up, I will study hard and explore more mysteries of nature.
I found the reason why mimosa is shy. I like colorful roses, plum blossoms that are proud of frost and snow, and sweet-scented osmanthus that smells ten miles more.
But my favorite is mimosa. It doesn't like publicity.
Seen from a distance, the mimosa is short and inconspicuous.
Its stem has many big leaves like feathers.
A closer look reveals that these big leaves are composed of many small oval leaves, one on the left and one on the right, arranged neatly along the veins.
The stems of mimosa bend upward, much like a dancing snake.
But the characteristic of mimosa is that it will be as shy as people.
When I gently scraped its veins, as if my parents were criticizing it, the leaves closed slowly in turn.
When I put it hard, it seems that someone is scolding it, and it will close the leaves quickly.
When I hit it hard, it was like a child. When it is severely criticized by the teacher, the leaves will close and droop.
It will take some time to spread the leaves and raise its head.
Wind and rain or lightning, strong light or dark and humid environment.
Will these be as effective as the touch of my fingers? With this question, I moved it from the light to the dark and from the dark to the outside. After a period of observation, I found that the change of natural environment only affected its growth, but it could not close its leaves.
I am full of questions to find the answer to this question. Many things happen. Finally, I found the answer in the book "100,000 Why". It turns out that there is an enlarged part, that is, specialized cells, where the leaflets, petioles and stems of mimosa are connected.
Most scientists believe that the shyness of mimosa is caused by the change of water content in specialized cells.
Under normal circumstances, specialized cells are full of water and remain full, so the leaves are open and the petioles are upright.
When we touch the leaves, the water in the lower part of specialized cells will flow upward or sideways quickly, so the upper part of specialized cells will bulge and the lower part will contract, so the petiole will droop and the opposite small leaves will close.
When a leaf of mimosa is closed by * * *, it will produce a power generation substance, which will quickly transmit the information of * * * to other leaves.
Other leaves, after receiving the message, also closed up quickly.
When this * * * disappears, the lower part of specialized cells is gradually filled with water, and the leaves will unfold again and return to their original appearance.
I found a new mimosa growing on my balcony.
The leaves of mimosa are oval, as light as small feathers and a little rough to the touch.
This tiny stem is so fragile that a drop of water can bend it.
When the wind blows, the mimosa swings with the wind, just like a girl dancing.
The oval petals are reddish and purple on their foreheads. How like little pompoms! Once, I accidentally met a mimosa, and its leaves shrank immediately and its petiole fell off.
What a shy little girl! I squatted down curiously. After a while, the leaves of the 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: It turns out that there is an enlarged organ called "leaf pillow" at the base of the petiole of mimosa, and there are many parenchyma cells in the leaf pillow, which is very sensitive to the outside world.
Once it touches the leaves, * * * will immediately spread to the occipital bone. At this time, the cytosol in parenchyma cells began to flow into the intercellular space, which reduced the expansion ability of cells and led to the decrease of intercellular pressure in the lower occipital region, resulting in the phenomenon of closed leaves and drooping petioles.
After a minute or two, the cell fluid gradually flows back to the leaf pillow, so the leaves return to their original appearance.
The reason why mimosa is like this is because mimosa lives in tropical areas where there are many storms.
Therefore, in order to protect itself in the harsh natural environment for a long time, whenever a storm comes, it immediately closes its leaves to protect itself from the storm.
I thank mimosa, which brings me curiosity.
I want to use this "key" to study hard, explore more knowledge and explore the mysteries of the plant kingdom.
Observing the composition of mimosa last summer, someone gave us a pot of mimosa.
At first, it was only six or seven centimeters long and had several leaves.
Mother said, "as long as you take good care of it, it will live."
"So I held a glimmer of hope and lifted it.
At noon a few days later, I suddenly remembered that it was time to water and fertilize, so I looked at the big place where the flowerpot was placed. "Ah, it's alive!" "At the sight of the mimosa in the pot, I almost jumped up in surprise. The ugly mimosa straightened her slender waist and stretched out three green leaves.
The delicate green leaves are swaying in the wind, as if a little girl is reaching out and calling to me.
I can't help reaching out and touching it. It actually put away its leaves shyly. After a while, it quietly dispersed them. How interesting! From that day on, I will go to see it or water it every day.
I found that mimosa grows a green leaf almost every day, and there are usually two or three small buds between each group of leaves.
When the bud grows for a week or two, it actually produces a purple ball, an oval flower without petals, and all the cores are very thin, just like an interesting little fluffy ball.
Facing the mimosa and recalling the scene where my mother asked me to plant it in a flowerpot, I was deeply immersed in thinking.
At this time, my mother came over and pointed to the mimosa and said to me, "Look, the mimosa is very small, but it has strong vitality. No matter what the environment, it can constantly strive for self-improvement. People like it. It always keeps its head down and is never proud.
"After listening to my mother's words, I know I want to be a self-reliant, humble and simple person like a mimosa.
I hope I can help you.
My new discovery why mimosa is shy 400 words My new discovery: Why mimosa is shy In nature, there is a special kind of grass called mimosa.
Why is it called mimosa? Because its leaves are very special, the hand will close when it touches the leaves, just like a shy little girl.
Out of curiosity, I dug a mimosa and took it home to plant it in a flowerpot.
I tease it whenever I have time.
I know that the leaves of mimosa are closed by * * *, so what * * * can make it react like this? Besides touching it with your fingers, is there anything else that can make it close its leaves? For example: wind and rain or lightning.
Strong light or dark and humid environment.
Will these be as effective as the touch of my fingers? With this question, I moved it from the light to the dark and from the dark to the outside. After a period of observation, I found that the change of natural environment only affected its growth, but it could not close its leaves.
I am full of questions to find the answer to this question. Many things happen. Finally, I found the answer in the book "100,000 Why".
It turns out that the leaflets, petioles and stems of mimosa have an enlarged part, which is specialized cells.
Most scientists believe that the shyness of mimosa is caused by the change of water content in specialized cells.
Under normal circumstances, specialized cells are full of water and remain full, so the leaves are open and the petioles are upright.
When we touch the leaves, the water in the lower part of specialized cells will flow upward or sideways quickly, so the upper part of specialized cells will bulge and the lower part will contract, so the petiole will droop and the opposite small leaves will close.
When a leaf of mimosa is closed by * * *, it will produce a power generation substance, which will quickly transmit the information of * * * to other leaves.
Other leaves, after receiving the message, also closed up quickly.
When this * * * disappears, the lower part of specialized cells is gradually filled with water, and the leaves will unfold again and return to their original appearance.
Oh! I see. I suddenly realized.
There are too many mysteries of nature, let's explore them together!
I found that I found the secret ingredient of mimosa. On the roadside where we must go to school, there is a short mimosa with slender stems and leaves like feathers.
As long as you touch it, the leaves will close and the whole mimosa will hang its head. How interesting! Therefore, we especially like to play with it. When we passed there after school, we all tried to feel ashamed of it. Seeing its "shy" appearance makes us feel endless fun.
This morning, Li Mei arrived before me and squatted down to play with mimosa. Suddenly, she exclaimed, "Come and see, mimosa is shameless!" " Zhang Ling and I ran up and saw the mimosa motionless.
I fiddled with it a few more times, strange! The leaves of mimosa really didn't close.
What a cheek.
Why don't the leaves of mimosa get together? It's probably cold. But I immediately denied this fleeting idea.
I remember accidentally meeting a mimosa a few days ago, and its leaves closed quickly! What's going on here? I'm confused.
When I came home from school, I found a book about plants and didn't know the secret until I read it.
It turns out that the petiole of mimosa and the place where the petiole connects with the stem axis are called leaf pillows, and the cells inside the leaf pillows contain water. When we touch the leaves, the water in the cells on the upper layer of the leaf pillow will flow to the gaps of other cells, and the upper part of the leaf pillow will wrinkle, so the mimosa will appear "shy".
But we often touch it constantly, so that the cell fluid in its leaf pillow is drained, and when it has no time to replenish it, there is a "shame" situation.
Unexpectedly, a humble little mimosa also contains such interesting science. It seems that we should pay more attention to observation and study at ordinary times! I discovered the secret ingredient of mimosa shyness. There is a mimosa in my yard. It has slender stems and feathery leaves. As soon as you touch it, it will close its leaves and then the whole mimosa will droop. It's really interesting.
Therefore, I especially like playing with it. When you pass by after school, you have to touch it with your hands. Seeing it "shy" makes me feel endless fun.
With this question, I consulted books about plants and finally learned the secret of mimosa's shyness. It turns out that it all depends on the "expansion" of its leaves. There is a "water drum" thin-walled cell tissue leaf pillow at the base of the petiole of mimosa, which is full of water.
When you touch the mimosa with your hand, the leaves vibrate, and the water in the cells at the lower part of the pillow immediately flows to the lower part and both sides, so the lower part of the pillow collapses like a deflated ball, the upper part bulges like a deflated ball, and the petiole droops and closes.
When the leaves of mimosa are closed by * * *, a kind of static electricity will be generated, which will quickly spread the information of * * * to other leaves, and the other leaves will be closed one by one (Yi Yi). Shortly after this * * * disappeared, the leaves under the pillow were gradually filled with water, and the leaves reopened and recovered.
Of course, moving plants are not just mimosa. You can also meet many such plants in nature, as long as you pay attention.
I discovered the mystery of mimosa, a strange name that only neighbors have heard of and classmates have mentioned.
As for what it is like, I know nothing about it.
I have always been full of doubts about it: how can a grass be shy? Why are you shy? What does his shyness mean? ..... However, when I was in the Botanical Garden today, I was surprised to find the mimosa described by everyone.
Mimosa gives people a delicate feeling, with thin leaves and smaller leaves.
There are four "thin shafts" on the petiole of mimosa, and the two sides of the "thin shafts" are covered with small leaves, which look like bird feathers.
Its leaves are small and green, just like tender grass buds just growing in spring, so cute! Pollen is like a ball, lace is a little gold powder, just like dandelion, so beautiful! Its petiole is scarlet, with small thorns on it, like the handle of a rose. If you are not careful, you will be stabbed.
The commentator also said, "As long as you gently touch its leaves, it will immediately close them in shame."
I want to try it with a grain of salt, but I'm afraid I'll break it.
Finally, driven by strong curiosity, I reached out my finger and touched it gently, only to see pairs of small leaves closed and drooping regularly along the leaf axis.
Mimosa is really shy! After a surprise, I have more mysteries in my heart.
With a lot of questions, I opened the encyclopedia and found the information of mimosa: mimosa originated in Brazil, South America, also known as mimosa, ticklish grass and cowherb, and it is a leguminous herb.
It is said that the climate in South America is humid, and there are often thunderstorms for several days.
When the first drop of rain hits the leaves of mimosa, its leaves immediately close and its petiole droops to avoid the damage of the storm. If an animal touches it a little, it will close its leaves and the animal will not dare to eat it.
It has gradually become today's mimosa, and its self-defense function has been inherited by children and grandchildren all over the world through gene transformation and superior generation inheritance.
Dad also told me that if I touch the mimosa on a sunny day, it will bloom for a while, although it will meet with leaves. If I touch the mimosa on a rainy day, it will meet for a while.
The faster you touch it, the faster it closes its leaves: the slower you touch the mimosa, the slower it closes.
If you touch it often, the mimosa won't open and close.
Mimosa also has many medicinal values: the whole herb can be used as medicine, and the root can be soaked in wine to treat rheumatic pain, neurasthenia, insomnia and so on. : lean meat stew.
Can be used to treat eye heat swelling and pain, hepatitis and nephritis: fresh leaves are mashed, can be used to treat swelling and pain, herpes zoster, and has the effect of relieving pain and swelling.
Lying in bed at night, I remembered what the teacher said: "Pay attention everywhere to learn something."
"Yes, today I observed and discovered the mystery of mimosa.
If a mosquito and fly lamp is invented according to the shy characteristics of mimosa, wouldn't mimosa have a greater effect on human beings? Ha! I discovered the secret of mimosa.
Nature is like a kaleidoscope, and all kinds of strange natural phenomena appear around us from time to time, but among the interesting question marks, what impressed me most was that I discovered the secret of mimosa's shyness.
Last year, my mother bought a pot of mimosa, which was very lush. I like it very much and find his name very interesting. Like me.
I wonder how it is afraid of shame.
Once, I touched its leaves lightly, and as a result, its leaves closed immediately. I was curious, so I touched other leaves with my hand, and it was the same. I stepped aside and stopped touching it. After a while, I didn't expect its leaves to spread slowly.
Moreover, I also found that in rainy and windy days, its leaves will also close.
"Why are the leaves of mimosa closed?" "Why is it closed in rainy and windy days?" "Are you really as shy as people?" I was puzzled and asked my mother with questions. My mother said, "Find the answer yourself.
"I went to check the information. After a long time, I finally found the reason: the leaves and petioles of mimosa contain a lot of water. Touch it with your hand, and the water on the leaves will flow to other places, so the leaves will roll up.
On the contrary, if you touch the petiole with your hand, the water below will go much more and the whole leaf will hang down.
In rainy days and strong winds, its leaves droop, which is its way of protecting itself from being broken by storms.
I suddenly realized that mimosa is not really shy! At this time, I am very excited, because I picked another small flower in the garden of science and caught a small fish in the ocean of knowledge, which I will never forget.
...
200 A new mimosa has grown on my balcony.
The leaves of mimosa are oval, as light as small feathers and a little rough to the touch.
This tiny stem is so fragile that a drop of water can bend it.
When the wind blows, the mimosa swings with the wind, just like a girl dancing.
The oval petals are reddish and purple on their foreheads. How like little pompoms! Once, I accidentally met a mimosa, and its leaves shrank immediately and its petiole fell off.
What a shy little girl! I squatted down curiously. After a while, the leaves of the 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: It turns out that there is an enlarged organ called "leaf pillow" at the base of the petiole of mimosa, and there are many parenchyma cells in the leaf pillow, which is very sensitive to the outside world.
Once it touches the leaves, * * * will immediately spread to the occipital bone. At this time, the cytosol in parenchyma cells began to flow into the intercellular space, which reduced the expansion ability of cells and led to the decrease of intercellular pressure in the lower occipital region, resulting in the phenomenon of closed leaves and drooping petioles.
After a minute or two, the cell fluid gradually flows back to the leaf pillow, so the leaves return to their original appearance.
The reason why mimosa is like this is because mimosa lives in tropical areas where there are many storms.
Therefore, in order to protect itself in the harsh natural environment for a long time, whenever a storm comes, it immediately closes its leaves to protect itself from the storm.
I thank mimosa, which brings me curiosity.
I want to use this "key" to study hard, explore more knowledge and explore the mysteries of the plant kingdom.
I discovered the secret world of mimosa. Newton, an unparalleled great scientist, discovered gravity. Madame Curie, a strong woman in the world, discovered radium and was called "the mother of radium". Roentgen discovered X-rays and became the first Nobel Prize winner.
Their discoveries all come from life. As long as we pay attention to the things around us, we will make such discoveries.
I have a little appearance.
I am ecstatic about this little discovery, and I am also excited about being crazy. This also made me understand a discovery. It's not difficult. It's difficult to ask why.
One day, I was playing in the community. Suddenly, a small mimosa caught my eye.
Curiosity prompted me to touch the mimosa.
This little mimosa immediately put away its leaves.
Why is this? I checked it as soon as I got home.
I quickly turned on the computer and typed "Why are mimosa shy?" These words.
After a while, the answer came out.
It turns out that at the base of the petiole of mimosa, there is a relatively enlarged tissue called "leaf pillow". The leaf pillow is filled with water, which often expands and maintains a great pressure, and the pressure at the lower part is greater than that at the upper part.
When the finger touches the mimosa, the leaves are shaken, and the water in the cells at the lower part of the occipital immediately flows to the upper and both sides. So the lower part of the leaf pillow sinks like a deflated ball, and the upper part bulges like a deflated ball, which makes the petiole droop and close, just like a girl is shy.
But after a period of time, the lower part of the leaf pillow gradually filled with water, and the leaves reopened and recovered.
In fact, mimosa leaves not only when it is touched by hand, but also when it is rainy or windy. This is how it protects itself from being destroyed by the storm.
It turns out that mimosa is not shy, but a way of self-protection.
Plants also have a lot of knowledge, so we must study hard and read more extracurricular books in order to master more knowledge.
There is a pot of mimosa on grandma's balcony. It is still a baby.
It was the first time I saw mimosa, and I was very moved.
On Sunday, I was idle and went to see the young mimosa again.
Mimosa is very sensitive at an early age.
As long as I touch her gently, she lowers her head and closes nine or ten bright green leaves tightly. What a shy little girl.
Seen from a distance, this mimosa is so small and lovely.
Gradually, the mimosa has entered adolescence, and it is 15 cm tall and strong enough.
Its stem is light green, and there are some furry thorns on it.
There are thorns under the green leaves of mimosa, which are sharp and thick.
The leaves of mimosa turned dark green.
A gust of wind blew, and the green leaves of mimosa actually closed.
So, I also tried to catch my breath, and the green leaves of mimosa closed.
God, the green leaves of mimosa are so sensitive! Slowly, the mimosa has grown into an adult.
The mimosa really blooms.
The petals of flowers are actually needle-shaped and pink.
Seen from a distance, this flower is very delicate.
Although mimosa is shy, shy flowers are not shy.
When I was a child, the little shy flower looked like a green pine cone, less than one square centimeter.
There is little Mao Mao on it, too.
Unfortunately, the good times didn't last long, and the life span of shame flowers was less than one day.
When a shy flower dies, there will be many seeds on it.
Bury them in the soil and start a new life.
Please indicate the source? The fourth grade Chinese composition "My Discovery-Mimosa" has 450 words.