CATDOLL : CATDOLL: A brief description of the growth process of silkworms in 300 words (How to write a brief description of the growth process of silkworms in 300 words)

1. How do silkworms grow?

The growth process of silkworms is divided into four stages: eggs, larvae, pupae and adults. The silkworms that have just hatched from the eggs are black. They look like ants and are called ant silkworms. Their bodies are covered with fine hairs, which will no longer be obvious after about two days.

Silkworms feed on mulberry leaves. After eating mulberry leaves continuously, their bodies will gradually turn white, and after a period of time, they will begin to shed their skin.

It takes about a day to molt, and the larvae do not eat or move, just like sleeping. This is called dormancy. After molting once, they are the second-instar larvae. Each time they molt, they grow one year older. They molt four times in total, and then they become the fifth-instar larvae to spin silk and make cocoons. The five-year-old larvae need two days and two nights to make a cocoon, and molt for the last time in the cocoon to become a pupa. After about ten days, they break out of the cocoon and become silkworm moths.

2. What are the 8 growth stages of silkworms?

1. Incubation

The silkworms that have just hatched from eggs are called ant silkworms. They are covered with fine hairs, which will become less noticeable after about two days.

Silkworms live on mulberry leaves. After eating mulberry leaves continuously, their bodies turn white. After a period of time, they begin to shed their skin. 3. Silkworms do not eat or move when they sleep. On the surface, they are sleeping, but in fact, they are shedding their old skin and replacing it with a new one to continue growing. Silkworms shed their skin 4 times during the entire breeding process. Each time they shed their skin, they do not eat or move. At this time, try not to disturb them, and do not throw them away thinking they are sick. Each sleep period of silkworms lasts about one day. 3. Silkworms spin silk

4. After molting once, it is the second instar larva. Each molt is counted as one year older. It takes four molts in total to become the fifth instar larva before it starts spinning silk and making cocoons.

Generally, the silkworms start to spin cocoons around 25 days old. When the silkworms' backs are shiny, yellow and transparent, it means that they are about to spin silk and spin cocoons. At this time, a cross-space should be provided for the silkworms to spin cocoons. 6. It takes two days to form a complete cocoon, and the silkworms complete the last molting in the cocoon and become pupae. 7. Break out of the cocoon

After about ten days, the female moth emerges from its cocoon and becomes a silkworm moth. After emerging from its cocoon, the female moth emits a scent from its tail to attract the male moth to mate. After mating, the male dies. The female moth can lay about 500 eggs in one night and then slowly dies.

3. What is the growth process of silkworms?

The growth process of silkworms

1. The silkworm babies have hatched. The silkworm babies that have just hatched from the eggs are black and are called "ant silkworms". Their bodies are covered with fine hairs, which will no longer be noticeable after about two days.

2. The silkworm grows up. The silkworm feeds on mulberry leaves. After eating mulberry leaves continuously, its body turns white. After a period of time, it begins to shed its skin. The molting period lasts for about a day. It does not eat or move like sleeping. This is called "hibernation".

3. After the silkworm spins silk and molts once, it is a second-instar larva. It gets one year older each time it molts, and it has to molt four times in total to become a fifth-instar larva before it starts spinning silk and making cocoons. 4. It takes two days and two nights for a five-year-old larva to make a cocoon, and it molts for the last time in the cocoon to become a pupa. 5. About ten days after the silkworm breaks out of the cocoon, it emerges as a silk moth and breaks out of the cocoon. After emerging from the cocoon, the female moth emits a smell from its tail to lure the male to mate, and the male dies after mating. The female moth can lay about 500 eggs in about one night, and then it will slowly die.

4. How do silkworms grow?

Silkworms eat mulberry leaves and slowly shed their skin to grow. Introduction: The life of a silkworm is divided into four stages: egg, larva, pupa, and moth. The newly hatched silkworm is called a first-instar silkworm. Because it is black and small, it is also called an ant silkworm. It will shed its skin four times during the larval stage. During this period, the silkworm grows one instar each time it sheds its skin, and its body grows a little bit, and it grows bigger, thicker, and whiter.

After molting four times, the silkworm becomes a fifth-instar silkworm. At that time, the silkworm will spin silk and make cocoons after eating mulberry leaves for a few days.

Silkworms are Lepidoptera insects. They feed on mulberry leaves and spin silk cocoons. They are one of the economic insects. Silkworms originated in China. As early as four or five thousand years ago, our ancestors planted mulberry trees and raised silkworms. This is one of the great discoveries recognized by the world. The growth process is as follows:

1. The silkworms that have just hatched from the eggs are black and hairy, like ants, and are called ant silkworms.

The ant silkworms grow slowly while eating mulberry leaves. After a while, they stop eating and moving, and enter a sleep state, just like a person sleeping.

After one or two days, it sheds its skin and starts eating mulberry leaves again, continuing to grow. This repeats four times until it reaches maturity.

2. Young silkworms not only grow fast but also tend to be crowded together. Therefore, you should expand and even out the seats before feeding them with leaves each time. After feeding, you should properly adjust the seat area of ​​the silkworms and leaves to achieve "one silkworm in three places" so that the silkworms do not touch each other, which is beneficial to their growth and development.

As the silkworm continues to eat mulberry leaves, its body slowly turns white, and after a period of time it begins to shed its skin. The shedding period lasts for about a day, during which it does not eat or move, like sleeping. This is called "hibernation."

The climate is good during the spring silkworm production period, the leaf quality is excellent, and the cocoon quality is good, making it easy to obtain high cocoon yields, which generally account for about 40% of the total annual cocoon production.

Therefore, raising spring silkworms well is the key to increasing silkworm farmers' income and completing the annual cocoon production task.

Although the climate is good, pathogens are few, and leaf quality is high during the spring silkworm period, silkworm diseases will occur in the later stage of spring silkworms if the disinfection of silkworm rooms and silkworm tools is neglected.

Young silkworms need to be fed with young leaves, while adult silkworms need to be fed with older leaves, because silkworms need to consume enough cellulose to spin enough silk to make cocoons.

If the mulberry leaves contain dew, etc., they need to be dried before feeding. If the mulberry leaves turn black and moldy, do not feed them to silkworms.

If the ambient temperature is too low, it is recommended to buy a heating lamp to heat the silkworms, so that you can raise silkworms all year round.

3. There is a pair of special organs called silk glands inside the body of the silkworm. The body of a mature silkworm is transparent and filled with silk.

It spins silk to make a cocoon around its body, and then sheds its skin again after spinning the silk, turning into a peanut-sized pupa, which does not eat or move, and stays dormant inside the cocoon. Ten days later, the pupa turns into a moth and emerges from the cocoon.

4. After the cocoon is out, the female moth's tail emits a smell to lure the male to mate. After mating, the male dies. The female moth can lay about 500 eggs in one night, and then slowly dies. From the first sleep to the fourth sleep, it takes about one month. So the life span of the silkworm is very short, just over a month. Extended information: Commercial value According to literature records and cultural relics, our ancestors began to plant mulberry trees and raise silkworms as early as the Neolithic Age more than 5,000 years ago.

The use of silk began at the end of the fishing and hunting era, while sericulture began at the beginning of the agricultural era, that is, the Yellow Emperor era.

During the Zhou Dynasty (1066-256 BC) sericulture had become specialized and came under official supervision.

By the Warring States Period (476-221 BC), silk had reached a high level of development, and had become the daily clothing of the poor and a commodity for free trade.

Many silk fabrics from the Warring States Period have been unearthed in various parts of China, including gauze, satin, damask, gauze, crepe, brocade, brocade, and embroidery. The beauty of their patterns and colors is astonishing.

During the Song and Yuan dynasties (960-1368 AD), silk production and silk weaving reached another peak. The Song Dynasty produced 3.4 million pieces of silk annually, and the rulers attached equal importance to the silk industry and farming.

There are often records of "combining agriculture and sericulture" in ancient Chinese books.

The idiom “A woman who does not raise silkworms may suffer from the cold” reflects the ancient people’s high awareness of sericulture.

5. Introduction to the four stages of a silkworm’s life?

The life cycle of a silkworm consists of four stages: egg, larva, pupa and adult.

Silkworm eggs:

Silkworms reproduce by laying eggs. Silkworm eggs look like fine sesame seeds, about 1 mm wide and 0.5 mm thick. A female moth can lay 400 to 500 silkworm eggs. 1700 to 2000 silkworm eggs weigh about 1 gram and have a diameter of 0.2 cm. The color of silkworm eggs is light yellow or yellow when they are first laid, and changes to light red bean color or red bean color after 1 to 2 days, and then turns to gray-green or purple after 3 to 4 days. It no longer changes and is called a fixed color.

The outer layer of the silkworm egg is a hard eggshell, and inside is yolk and serous membrane. The embryo in the fertilized egg continuously absorbs nutrients during the development process and gradually develops into a silkworm. It crawls out of the eggshell, and the eggshell becomes white or light yellow after it is empty.

The first instar is four to five days; the second instar is three to four days; the third instar is four days; the fourth instar is six days; the fifth instar is seven to nine days; the pupal stage is fourteen to eighteen days; and the moth stage is three to five days.

larva:

When the silkworm hatches from the egg, its body is brown or black, very small, and covered with fine hairs, and it looks a bit like an ant, so it is called ant silkworm. The ant silkworm is about 2 mm long and 0.5 mm wide. After it crawls out of the egg shell, it will eat mulberry leaves after 2 to 3 hours.

silkworm chrysalis:

After the silkworms spin cocoons on the cocoon nest, they will turn into pupae after about 4 days. The body shape of the silkworm pupa is like a spindle, with three body sections: head, thorax and abdomen. The head is very small, with compound eyes and antennae; the thorax has thoracic legs and wings; the bulging abdomen has 9 body segments. Professional workers can distinguish the sex of silkworms from the lines and brown dots on the abdomen of the silkworm pupa. When the silkworms first pupate, their body color is light yellow and the pupa body is tender and soft. Gradually, it will turn into yellow, yellow-brown or brown, and the pupa skin will also harden. After about 12 to 15 days, when the pupa body begins to soften again and the pupa skin is a little wrinkled and earthy brown, it will turn into a moth.

6. What changes occur in the life of a silkworm?

The life of a silkworm goes through four stages: egg, larva, pupa and adult, which is a complete metamorphosis.

1. Silkworm eggs look like fine sesame seeds, about 1 mm wide and 0.5 mm thick. A female moth can produce 400-500 silkworm eggs, weighing about 1 gram. Silkworm eggs are light yellow or yellow when they are first laid, and turn into red bean color after 1-2 days, and then turn into gray-green or purple after 3-4 days, and then no longer change, which is called fixed color. The outer layer of silkworm eggs is a hard eggshell, and inside is yolk and serosal membrane. The embryo in the fertilized egg continuously absorbs nutrients during the development process and gradually develops into an ant silkworm. It crawls out of the eggshell, and the eggshell becomes white or light yellow after it is empty.

2. Larvae Larvae are the growth stage of silkworms to absorb food and nutrition. They feed on mulberry leaves. After eating mulberry leaves continuously, their bodies gradually turn white. After a period of time, they begin to shed their skins. They shed their skins for about a day, and do not eat or move like sleeping. This is called "hibernation". After molting once, the larvae are the second-instar larvae. Each molt is counted as one year older. They molt six times in total (once for the first, second, third, fourth, and fifth instar silkworms, once for pupae, and once for moths). It takes about 6-8 days for the fifth-instar larvae to start spinning silk and making cocoons.

3. Pupa stage: About 4 days after the silkworm spins silk and makes a cocoon, it will turn into a pupa. The body shape of the pupa is like a spindle, with three body segments: head, thorax and abdomen. The head is very small, with compound eyes and antennae, the thorax has thoracic legs and wings, the bulging abdomen has 9 segments, and is brown in color.

4. Silkworm moth stage When the silkworm just pupates, its body color is light yellow and soft, and gradually it will turn into yellow, yellowish brown or brown, and the pupa skin will become hard. After about 12 to 15 days, when the pupa body begins to soften again, the pupa skin is a little wrinkled and turns into a brownish earthy cocoon color, it will become a moth.