This semester, the science teacher assigned us an interesting task-observing the life of silkworms.
On Friday afternoon, I couldn't wait to come to school to buy silkworms. There are three kinds of silkworms: black, yellow and white. I bought five white silkworms. When I got home, I put them in a box. The little white silkworm looked up at me and seemed to say, "Master, I'm hungry, I'm hungry." I quickly brought some mulberry leaves to these little guys, only to see them crawling slowly, climbing onto the mulberry leaves and eating them with relish.
A few days passed, and I went to see silkworms. The young silkworm becomes white and fat. Mulberry leaves have been gnawed several holes, and there are many small black particles in the box. My mother said, "This is silkworm excrement." I cleaned up the small particles and put some fresh mulberry leaves on them. I gently touched the silkworm, soft and comfortable! A few days later, the silkworm became white and bright, and slept motionless on the mulberry leaves. At this time, I was anxious and thought, "Is the silkworm baby sick? Why don't you move? " With questions, I quickly went online to check the information, and I found the reason. It turns out that the silkworm stopped eating after peeling for five times and climbed onto the mulberry bush to form cocoons. After that, they will climb to a corner of the box, spit out silk and turn into cocoons. The cocoon is oval and white, like a little pigeon eggs, so beautiful! The silkworm in the cocoon made no sound. After a few days, the cocoon opened the window and became a beautiful moth girl.
By observing the life of silkworm, I know the great contribution of silkworm to mankind. Silk can be made into silk quilt, silk mask, silk ... Silkworms have been silently paying and contributing to mankind all their lives. I must learn from this great selfless dedication of silkworm.
My mother has a silkworm baby in the country. I asked my mother, "Why do you want to keep silkworm babies?" Mother said, "Because we want the silkworm baby to spin silk to make cocoons, and then peel the cocoons to make quilts and cotton-padded jackets."
On weekends, I clamored to go to the countryside with my mother. My mother said, "The countryside is very dirty, which will make clothes and shoes dirty." I said, "I will listen to you. I won't get my clothes and shoes dirty." Only in this way will my mother take me to play in the country.
I sat behind my mother's battery car and soon arrived in the country. I finally saw the silkworm baby. They all stuck their heads out and crawled around. I asked my mother, "What happened to them?" Mother said, "They are hungry. We should give them something to eat at once. " So, my mother hurried to pick mulberry leaves for them to eat.
In this way, my mother and I came to the mulberry garden, and the mulberry trees were covered with purple mulberry fruits, which looked very gorgeous. My mother wrapped a big bag of mulberry leaves, so I buried my head in it. My mother was picking mulberry leaves. I saw a bug crawling on a mulberry tree, so I caught it, ate mulberry leaves and played with it, and accidentally stuck its hair on my arm. When my mother finished picking mulberry leaves, I found that my mouth was full of purple mulberry pulp and my arms were full of red spots, which made people laugh and cry. When I got home, my mother washed my arms and face and painted my arms with toilet water.
Then, we go to feed the silkworm baby with mulberry leaves. We put mulberry leaves on the silkworm baby and immediately heard the rustling sound of the silkworm baby. Soon they all climbed up to eat, and I seemed to hear them say, "Thank you for bringing us such delicious food. We will surely make a big and good cocoon to repay you!" "
Why is Class 49 so busy on Friday afternoon? It turns out that they are having a sericulture achievement exchange meeting.
The Chinese teacher strode to the podium, wrote the theme of the exchange meeting on the blackboard and began to talk about cocoon knowledge. For example, the colors of cocoon are white, gray, gold, light yellow, red, pink and so on. He also asked us to measure the size of cocoons. My size is about 3 cm long and 1 wide. 5 centimeters. The teacher said that what is in the cocoon is called pupa, and the silkworm moth comes from the pupa. He also said that anyone who wants to see what a pupa looks like can peel it off and have a look, but don't peel it too much, it will die.
As soon as the students heard it, they began to peel it. Yang Junyi and I peeled a yellow cocoon first. When we first started peeling, we were afraid that the cocoon would be peeled to death. We just pulled the silk out bit by bit, but it took a long time to finish. So Yang Junyi decided to pinch one end of the cocoon with his nails, trying to pinch a small hole in the cocoon. But this method is not as good as reeling, and it hasn't broken a few roots after a long time. Finally, we have to use our unique skill-cutting with a knife. This method really worked. When we cut the place where Yang Junyi pinched it with a knife, a small hole appeared. But we found that the pupa was black and soft, and it didn't feel normal. I didn't know the pupa was dead until I asked the teacher. How disappointing, we finally cut off a dead pupa. No way, we have to choose another pupa to cut. This time it finally came alive. We took the pupa out and observed it carefully, and found that it was yellow all over, like the head of a bee. Its body is divided into eight sections, each with two symmetrical black spots and a black line on its back. It looks very cute. The two of us put it on a piece of white paper and looked at it again and again.
Then the school bell rang, and my beloved pupa and I went home happily.
A few days ago, the team leader gave me some silkworm babies. These silkworm babies shine like carnivores and arch around, which makes people a little sick. But this is a practical activity arranged by the teacher, so I have to bite the bullet and take them in. But after long contact, I became attached to them for a long time. I think they are cute, and I gradually like them.
I will observe the changes of these silkworm babies every day. Suddenly, I found a small black spot under each abdomen. "What is this?" I asked my mother. But mom didn't know, so I had to go online for help. It turns out that the black spots are silkworm valves. Silkworms have no fixed body temperature, and their body temperature will change with the surrounding temperature. There are many valves on both sides of the silkworm's body. Once the ambient temperature changes, it will adjust the body temperature by opening and closing the valve to adapt the body temperature to the surrounding environment. No wonder I feel their bodies are always cold when I touch them.
Silkworm babies are getting bigger and bigger, and it takes a lot of effort to change mulberry leaves every time. It's really hard to keep them away from those withered mulberry leaves. Their feet are firmly glued to the mulberry leaves, and their tails are like clips, holding them hard and refusing to leave. Why is this? Are they reluctant to leave the withered mulberry leaves, or are they insecure? I can only find the answer by myself again. It turns out that every silkworm has eight feet, the first three are used for climbing, and the last five are like small round suckers, which can firmly absorb mulberry leaves and won't fall off. "So they are protecting themselves!" I can't help sighing.
Little silkworms also have so much knowledge, which is really boundless. This practical activity really opened my eyes.
There is a craze for sericulture in our school, and I also bought some for fun at the stall. I see, what an ugly little silkworm! This little silkworm is only half the size of sesame and has fine hairs on it. An aunt saw through my mind and said to me, "In two days, the little silkworm will be fat in vain."
After two days, the original black silkworm turned yellow, with much less hair and fatter body. I sliced the mulberry leaves and fed them to the young silkworms bit by bit. A few days later, the little silkworm has become white and fat, with no hair, a big head and a big appetite. I must feed it more mulberry leaves. One day, I found that the silkworm that had not been idle for a moment became very quiet. Mulberry leaves, which were originally attractive to it, are also dying. Is it dead? I hurried to ask my mother. Mother said that silkworms have to shed their skin, and each time they shed their skin, they grow one year old. After listening to my mother's words, I immediately turned worry into happiness.
Under my careful feeding, the silkworm grows white and fat, and the mulberry leaves near my home are not enough for it to eat. Silkworm's mouth is also very cunning, don't want old and yellow mulberry leaves. I have to go further. When I find many leaves, I will pick more and put them in the refrigerator.
When the silkworm baby eats, Doudou's mouth is like a harvester, and it rustles. Some silkworms press on another silkworm, so that the silkworms below can't move: some bite a hole in the middle; Others keep mulberry leaves with their feet and eat them greedily. One of the young silkworms is very strange. It bit the stem on the leaf. Some holes of different sizes immediately appeared on the mulberry leaves.
As the saying goes, silkworms in spring will weave until they die, and candles will drain the wick every night. I hope the little silkworm will grow up soon, and let me see how it spins silk and forms cocoons.
In order to explore the mystery of silkworms, my family and I decided to raise silkworms once and have a close contact with them.
The first thing I saw was a pile of black round particles, which were silkworm eggs. We put it in an open little box. Soon, the silkworms hatched, small and black, like black pigtails. Except that the head is a little white, the rest are all black. A few days later, the silkworm turned white. You can clearly see that the silkworm's mouth is a black spot. There are two small teeth under the black spot, which are used by silkworms to eat mulberry leaves. In a few days, the silkworm will shed its skin. Silkworms don't eat or drink before molting. I thought silkworm was ill. When a silkworm molts, there will be two layers of skin on its tail, and then one layer will automatically fall off and the other layer will not move. After molting, silkworms start eating and drinking again. The molting silkworm is getting whiter and whiter, and the tip of its tail is slowly standing on end.
As the silkworms get bigger and bigger, their food intake is getting bigger and bigger, and the silkworm excrement (stool) is getting bigger and bigger. Silkworms should be three or four years old now. The body turns white and the mouth becomes flat, so you can eat mulberry leaves better. The tip of the tail stands upright. It is said that everything produced by every part of silkworm is precious. Silk from silkworms can be woven into silk quilts, which can give people warmth. Silkworm excrement is a traditional Chinese medicine, which can be boiled, boiled and boiled. Moreover, silkworms were already "treasures" in the hands of the ancients, so many poems describing silkworms were written, among which "Spring silkworms must be woven until they die" is a typical one.
Silkworm, in our mind, is a lovely type, full of treasures. I hope all of us can join hands to protect silkworms and animals.
After learning the lesson "Silkworm Girl", the teacher gave us some silkworm babies to keep. I was glad to take them home, put them in a big paper box and put them on the table, a total of eighteen. I made a hook at home, tied it to a long bamboo pole, took it to the mulberry tree in the yard, and hooked a lot of mulberry leaves. I took them home to eat a lot of mulberry leaves, wrapped the rest in a wet towel and put them in the refrigerator. I feed them a lot of food as soon as I get home every day and watch their growth.
There are six thin and small legs in front of the silkworm baby's stomach. There are no legs on the stomach, and there are some bigger legs behind the stomach. Silkworm baby just holds mulberry leaves with its front six legs, and its mouth is like a small excavator, digging the leaves into its mouth. Soon, a mulberry leaf was dug into a crescent-shaped pit by it. The little silkworm kept eating and then skinned it several times. In less than two weeks, it became as thick as my little finger. Three weeks later, some silkworm babies began to find a corner of the box and began to spin silk and cocoon. In the next few days, some silkworm babies cocoon one after another, until all the silkworm babies finally cocoon. Some of their cocoons are golden yellow, some are light yellow, some are light turquoise, and most of them are white.
After more than a week, the cocoon broke and the fat moth flew out. They are in no hurry to fly away. I heard that they will wait until they lay eggs.
Looking at these white fat moth girls, I feel very fulfilled and happy, and I have a deep understanding of the growth process of silkworms. This sericulture is so meaningful!
One day, my mother came home from work with a box in her hand. I asked curiously, "Mom, what's that in your hand?" Mom smiled mysteriously and said, "You'll know what's inside when you open it." I opened the box excitedly. It turns out that there are many silkworm eggs in the box. I shouted with joy, "Great!" "However, how to raise? Mother said, "You spray water on silkworm eggs to make them have enough water. Remember to observe them every day. Maybe in a few days, the silkworm can be born. "
I did as my mother said. Sure enough, a few days later, when I looked at my silkworm eggs again, I found something black moving. I'll call my mother right away. She looked at it and said, "Is this a silkworm baby?" I said, "Maybe." Because my mother and I didn't think that little silkworms were born this color. My mother and I quickly bought a lot of fresh mulberry leaves and put them in to make them full and grow up quickly.
A week has passed, and there are many small silkworms in the small box. I don't know why, some young silkworms may die of malnutrition. Soon, there are only five little silkworms left in the small box, but I won't give up. I will try my best to raise these five little silkworms. I saw that the old leaves were a little dry, so I immediately put on new leaves. When I saw the little box was a little dirty, I cleaned it at once.
It has been more than ten days since my mother brought back the little silkworm. These little silkworms look white and fat to me. My mother can't help but praise me for raising young silkworms so well.
I see these little silkworms every day now, and my heart is full of sweetness.
This semester, the science teacher Shi assigned us a task-raising silkworms. Hearing the news, the students jumped three feet with excitement. As soon as school was over, I ran home in lightning speed and told my parents about it. I excitedly took out the little black silkworm eggs from the science bag and put them in a transparent box, looking forward to the new look of the little silkworm.
Every day when I come home from school, I go to see it first. Silkworm eggs are black at first, like small sesame seeds, and gradually turn white, and a small round black dot can be faintly seen inside. One day when I came home from school, I was surprised to find several small and ugly silkworm babies crawling out of their eggs. I called my parents excitedly.
Silkworm rearing has officially started. My father and I immediately found a beautiful paper box, covered it with some spotless white paper, and poked several small holes in the lid. In this way, Silkworm Baby's new house was completed. Then, in order to give them "food", I strode downstairs, picked some fresh mulberry leaves, sliced them and put them in the box. I saw the silkworm baby slowly get up and chew the food with relish. Silkworm babies grow up day by day and eat more and more. A few fresh mulberry leaves were chewed into a semicircle in the blink of an eye. They eat day and night, but every few days, it will be motionless and peel off a lot. Every time it takes off its skin, it becomes fatter and whiter. The full silkworm babies have different shapes, some are lazy, some are slowly stretching and contracting, as if looking for friends to play and frolicking, and some are looking around with their heads held high.
When they become fat and transparent one day, they stop eating. They found a safe and comfortable place and built a warm house. The house is beautiful, with gold, yellow and white.
I love my silkworm baby.
In March this year 10, the school let the students raise silkworms by themselves, and all of them were so excited that they couldn't describe it. Each of us got more than 20 young silkworms and a pack of mulberry leaves from school and took them home to raise with our parents.
When I got home, I carefully held the silkworm babies as white as snow and built a new home for them with wooden boxes. Silkworm babies crawl around softly, so cute. Every day after school, I take time to feed them carefully. Wash and dry fresh mulberry leaves first, then sprinkle them into small pieces, and then sprinkle them on young silkworms. I saw the little silkworm climb from under the leaves to above them. At this time, the leaves gradually become smaller and the body of the young silkworm gradually becomes larger. They have to take off a layer of skin in a few days, and the silkworm babies eat rustling mulberry leaves day and night and keep growing. All 20 silkworms may have been eaten, and a bag of mulberry leaves distributed by the school will soon be eaten up. Dad bought mulberry leaves twice on Taobao, and they ate them quickly. One centimeter, two centimeters ... until one day it is fat and big, and it becomes lazy when it is white and bright all over. During this period, several times, I held mulberry leaves to their mouths, but they didn't move. I'm worried, and I keep muttering: Silkworm baby won't die, will it? How should I explain to the teacher? I'm a little sad. At this time, I saw Mr. Wang Kexue saying in WeChat: "Silkworms have to go through five times of peeling before they can grow mature. When peeling, they don't eat silkworm leaves. When you become a five-year-old silkworm, you should spin silk as a cocoon. " I felt a sort of surge of relief. Soon, I found that silkworm babies spit out a lot of silk in the corner of the "house". The more they spit, the denser they spit, and they wrap themselves in it, and their bodies gradually shrink, forming an oval thick white cocoon.
They became pupae in the cocoon, and a few days later, the pupae became moths and emerged from the cocoon. After mating, these moths lay many eggs. I carefully collect silkworm eggs and raise them next spring.
After raising silkworms for more than a month, I realized that silkworms are selfless all their lives. What a wonderful "spring silkworms will weave until they die"!
Silkworm fourth grade composition 1 1 It's spring for everything to grow. The science teacher gave us a pack of silkworm eggs, which allowed us to increase our knowledge while raising silkworms.
When I got home, the first thing I did was to put the silkworm eggs on a piece of white paper and prepare for hatching. Silkworm eggs are purple-gray, not much bigger than sesame, round, with a small concave point in the middle. Three or four days later, a little black thing crawled out of the silkworm egg. Look carefully, "ah, it's an ant silkworm!" " "I shouted, hurriedly put the ant silkworm on the mulberry leaf that has been cut into strips with a brush. After a week, the black ant silkworm shed its hair and became fat, thick and long, so cute! Now silkworms eat a lot, from one or two to three or four, and soon there will be a big hole in the mulberry leaves, which will rustle from time to time. The way young silkworms eat is very interesting! They first crawl arch by arch, looking for food, and then eat in various positions, some clutching mulberry leaves; Some use their bodies to wrap mulberry leaves; Some are cocky and seem to be very successful; Others want to crowd out their little friends. It is really interesting! A few weeks later, I found that many silkworms in the shoe box had "fasted". I didn't know those silkworms were spinning until I asked my mother! Sure enough, the next morning, the silkworm lay around, wrapped itself in silk and woven into a cocoon as white as a shrinking egg.
The ancient poem says well, "Silkworms in spring should spin until they die, and candles should cry the wick away every night." Silkworm rearing not only taught me knowledge, but also made me understand that silkworm's life is to send silk to people. This selfless dedication is worth learning. At this point, silkworm is my teacher.
12 Silkworm fourth grade composition: Spring is blooming, and everything is new. I went to my grandmother's house for the weekend with joy all the way. Walking by the roadside, a mulberry tree covered with tender leaves attracted me and reminded me of the silkworm baby I raised last year. After a winter, I wonder how they are now.
When I got home at night, I couldn't wait to open the box of cocoons. I really don't know. I was shocked when I saw it. A group of humble little guys in our family crawled lazily in the box. Small silkworms as thin as needles are only 2~3 mm long, and the whole body is black and not slippery, just like a group of Cinderella. More than 40 silkworms frightened us, and we were unprepared. My mother and I are sweating with anxiety.
Without mulberry leaves, would you starve to death? Can't so many small lives be destroyed? I was so anxious that I muttered to myself. Hurry up and check the computer. Fortunately, the leaves of lettuce can still fill the silkworm's stomach. Just because there is a lettuce at home, I suddenly breathed a sigh of relief.
I saw my mother and I armed to the teeth, a magnifying glass, a brush and a flashlight set a table. "Here's one." "Be careful, don't leave that!" I carefully searched for silkworm babies with a flashlight, and my mother carefully swept silkworms into their "small house" with a brush in her hand, and then spread a "carpet" on it-cabbage leaves and put food-lettuce leaves.
At this time, the little silkworm has already started to treat people to dinner. What a wonderful treat! Looking at their lazy appearance, I have a sense of responsibility. I seem to be the "king" of this "little kingdom", and I will certainly feed my "people" well.
Looking at the gluttony of this group of Cinderella, it suddenly occurred to me that when they are older, I should divide some students so that they can also know the joy of sericulture and harvest!
My little cousin gave me a piece of mulberry leaf, on which two silkworm babies were lying lazily. I was so happy that I quickly found a box and put the silkworm baby in it. I think: a piece of mulberry leaves can make them eat for a day. Reality is totally different from imagination. It turns out that they are foodies! It didn't take long for the mulberry leaf to have only the residue they didn't eat. I had to go to the park near my home and find some fresh mulberry leaves to feed them.
How on earth do they eat? A small head can eat so fast. In order to understand this reason, I put the mulberry leaves in and opened the lid. I squatted aside and observed them carefully. I saw them crawling slowly on the mulberry leaves, but their heads were held high from time to time and their mouths were crawling quickly. Soon the mulberry leaves were bitten out of a hole. It seems that their title of eating goods really deserves its reputation.
The next day, there was only residue left in the box, and there were some small black things left, probably their poop. I still picked a few small mulberry leaves like the first day. I want to put the silkworm baby on the fresh mulberry leaves and then dump the residue and black manure, but the silkworm baby just sticks to a residue, so I have to put that residue aside and dump the others. The next task is more difficult, because it is not easy to put them on new leaves without hurting the silkworm baby. I held one gently and pulled it carefully, but they moved. Mom said, "It's not easy. As long as the residue is put on the new leaf, the silkworm will climb over when it wants to eat the new leaf. Why not just take the residue away? " I did so, and the silkworm baby did climb to the new leaf slowly, but the tail was still stuck with residue, and I had a hard time getting it off.
It seems that raising silkworms is not easy.
There is an assignment in science class recently: sericulture. I came home in high spirits, opened the box and counted it: one, two, three, six in ....................., seven in all. Hehe, I counted and remembered the story of the seven dwarfs. Since the seven dwarfs all have their own names, so should these silkworm babies! So I gave this silkworm baby some interesting names. The first is to eat more and eat faster, which is called "greedy ghost"; Second, I sleep every time I watch it, so I'm called "little slacker". The third stripe on the back is called "zebra stripe"; Article 4 is very active, so it is called "naughty"; The fifth reminds me of the lovely Minions, called "Little Yellow Silkworm"; Article 6 whenever I come to see it, I will look up at me with puzzled eyes, which is called "little question mark"; The last one with a black back is called "The Dark Messenger".
Later, I found that every little silkworm has a thorn on its back. I don't know why. After checking the information, I know that the sharp thorn is male and the round thorn is female. I counted two males and five females.
When silkworms eat mulberry leaves, they can't find anything without looking carefully, but looking carefully, I find that silkworms eat mulberry leaves regularly: eat from left to right, repeat nine to twelve times, climb forward twice and continue to eat. What surprises me most is that these silkworms will rest after eating mulberry leaves, and even raise their heads during the rest, ranging from one to two minutes to four or five minutes.
Observing the silkworm, I suddenly feel that the silkworm is still quite mysterious to me, and I can't wait to see it shed its skin.
15 On Tuesday, the teacher assigned an assignment that was interesting for boys, but terrible for some girls, that was sericulture.
In the last science class in the afternoon, the teacher handed out silkworm eggs. I was so excited that I gently stroked their bodies with my clean little hands. Wow! They are like unborn babies. At this time, the teacher said loudly, "put away the silkworm eggs!" " Class is over! "
After school, I carefully took the silkworm eggs home. I told my mother that this was homework, and my mother began to accompany me to raise silkworms.
The next day, I got up early in the morning, ran to the front of the silkworm eggs, and found the little silkworm out. However, I don't have mulberry leaves yet! What should I do? My little silkworm is starving. I am in a hurry. Suddenly I saw several silkworms eating mulberry leaf residue! So my strong heart tells me that you will find mulberry leaves, come on! At this moment, I glanced at my watch and screamed, "God, I'm late!" " "I ran out of the house and took a few breaths. Then run, run to the bus stop in one breath. On the road, I am like a very fast horse!
At school, I asked my classmates for an oversized mulberry leaf. After school, I rushed into the house and hurriedly put mulberry leaves into the silkworm nest.
After a few days, I found that my little silkworm has grown up a lot. From ant silkworm to 30 silkworm. Wow! They eat too fast, and the mulberry leaves will be eaten up again. I thought to myself, "If mulberry leaves are really eaten up, they will starve to death. No, I have to think of a way quickly. " Just then, my mother said, "I asked the child for some mulberry leaves, and you can bring them back tomorrow." The next day, I picked mulberry leaves and went home to put new leaves on silkworms.
A few days later, when I went to change mulberry leaves for big silkworms, I suddenly found it unnecessary to change them. You must want to know why. Because, they are cocooned.
In the following days, I will continue to observe the changes of silkworms and carefully record their growth process.