CATDOLL : CATDOLL: The growth and change process of silkworms (record of the growth and change process of silkworms)

1. What is the growth and development process of silkworms?

The growth process of silkworms:

Silkworm eggs: Silkworms reproduce by eggs. A female moth can lay 400 to 500 silkworm eggs. 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 will no longer change and is called a 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.

Ant silkworm: When the silkworm hatches from the egg, its body is brown or black, very small, and has many fine hairs, and looks a bit like an ant, so it is called an 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.

Silkworms eat a lot of mulberry, so they grow very fast and their body color gradually fades. But their appetite gradually decreases or even stops eating. They spit out a small amount of silk, fix their abdomen and feet on the silkworm seat, raise their head and chest, and stop moving, as if they are asleep. This is called "sleeping". The sleeping silkworm may seem motionless on the outside, but it is preparing to shed its skin inside. After shedding its old skin, the silkworm enters a new stage of growth. It sheds its skin four times from ant silkworm to spinning silk cocoon.

Silkworm age: also known as age, which indicates the development stage of the silkworm. From the first molt to the first molt is the first age; after waking up from sleep, it enters the second age; after the second molt, it enters the third age; after the third molt, it enters the fourth age, and the fourth molt is also called the long sleep. After the long sleep, it enters the fifth age. The fifth-age silkworm grows very fast, with a body length of 6 to 7 cm and a weight of about 10,000 times the weight of the worm.

Mature silkworms: When silkworms reach the end of the fifth instar, they gradually show the characteristics of maturity: first, the feces they excrete change from hard to soft, and from dark green to leaf green; their appetite decreases, and the amount of food they eat decreases; the front digestive tract is empty, and the chest becomes transparent; then they stop eating completely, their bodies shorten, and their abdomens tend to be transparent; their head and chest are raised, they spit out silk threads from their mouths, and they swing left and right and up and down to find a place to build their cocoons. Such silkworms are called mature silkworms.

Cocooning: People put mature silkworms in special containers or on cocoons, and the silkworms will spin silk and make cocoons.

Cocooning can be divided into four stages:

1. The mature silkworms first spin out silk, which is attached to the cocooning device, and then spin silk to connect the surrounding cocooning branches to form a cocooning support, that is, a cocooning net. The cocooning net does not have a cocoon shape, but is just some soft and messy cocoon silk layers to serve as a cocooning support.

2. After the silkworms have woven a cocoon net, they continue to spin out messy silk circles to thicken the inner layer of the cocoon net, and then spin silk in an S-shaped pattern, beginning to form the outline of the cocoon, which is called the cocoon coat. The silk fibers of the cocoon coat are thin and brittle, arranged very irregularly, and contain a lot of sericin.

3. After the cocoon is formed, the cocoon cavity gradually becomes smaller, and the front and back ends of the silkworm body bend toward the back to form a "C" shape. The silkworm continues to spit out cocoon silk, and the spinning method changes from S shape to ∞ shape, which starts the process of cocooning.

4. When the silkworm's body is greatly reduced due to spinning a large amount of silk, the swinging speed of the head and thorax slows down and there is no definite rhythm. The silk spinning begins to appear messy, forming a loose and soft cocoon silk layer, which is called pupa lining.

Silkworm pupa: After the silkworms make 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 silkworm pupa from the lines and brown dots on the abdomen. When the silkworm just turns into a pupae, its 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.

Silkworm moth (adult): Silkworm moths are shaped like butterflies, with white scales all over their bodies, but because their two pairs of wings are small, they have lost the ability to fly. The head of the silkworm moth is spherical, with bulging compound eyes and antennae; the chest has three pairs of thoracic legs and two pairs of wings; the abdomen has no ventral legs, and the terminal body segment has evolved into external genitalia. The female moth is large and crawls slowly; the male moth is small and crawls faster, with its wings vibrating rapidly, looking for a mate. Generally, the female moth can lay fertilized eggs 3 to 4 hours after mating. The male dies after mating, and the female moth can lay about 500 eggs in one night, and then slowly dies.

The silkworm lays eggs, hatches into silkworms, turns into pupae, and then turns into moths, completing the cycle of a new generation. This is the life history of the silkworm.

2. 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.

3. What is the growth process of silkworms?

The growth process of silkworms is divided into four stages: eggs, larvae, cocoons, and adults.

Silkworm eggs are transparent in the early stages and black in the later stages. The newly hatched larvae are black and feed on young mulberry leaves. The later larvae turn white and feed on old mulberry leaves. The fifth-instar larvae will spin silk cocoons and break out of the cocoons after ten days to become adults.

1. Silkworm eggs

The first stage of silkworm growth is the silkworm egg. The silkworm egg is round and small in size. The newly laid silkworm egg is transparent. At this time, wrap the silkworm egg in a paper towel. After a period of time, the silkworm egg will turn black and the larvae will hatch.

2. Larvae

The second stage of silkworm growth is larvae. The newly hatched larvae are black and covered with fine hairs. At this time, they need to be provided with fresh mulberry leaves to supplement their nutrition. After a week, the silkworms will turn white and begin to shed their skin. A larvae must shed its skin four times in total before it can grow to maturity.

3. Cocoon

The third stage of silkworm growth is cocooning. After four moltings, the silkworms are fifth-instar larvae. At this time, the larvae have the ability to spin silk and make cocoons. They will climb to the corners of the breeding box or the artificially provided area to spin silk and wrap themselves in it.

4. Adult

The fourth stage of silkworm growth is adult. After the cocoon is made, wait for ten days for the silkworm pupa to break out and become an adult. At this time, cover the container with a net to prevent the adult from flying away. After waiting for a day, the adult will mate on its own, lay silkworm eggs, and wait to die.

4. What are the growth changes of silkworms?

From the time the silkworms hatch, measure and observe their growth and changes and record them

1. The little silkworms that hatch from the eggs are called "ant silkworms". They are dark black, like ants, and can only eat some tender mulberry leaves. After about a week, they will shed a layer of skin, and the color will turn light black, and their bodies will grow a little bigger. After about 10 days, the silkworms will shed another layer of skin, and the color will turn grayish white.

Their bodies grew bigger, and when they ate the mulberry leaves together, the sound made was like the "rustling" sound of rain. After about a week, they would shed another layer of skin and grow plump and white. After another week, they stopped eating the mulberry leaves, and their bodies became transparent, like strips of white jade. They began to spit out crystal clear filaments from their mouths, which kept wrapping around themselves.

Before you know it, a bright white cocoon is made. About a month later, a silk moth breaks out of the cocoon and lays countless sesame-sized eggs nearby. After a while, these eggs will hatch into countless baby silkworms.

2. The hatching of silkworm eggs requires suitable temperature and humidity.

3. Molting is a significant feature of the silkworm's growth process. The silkworm's body changes every time it molts. Silkworms molt 4 times in the larval stage and 2 times in the pupal stage (inside the cocoon), for a total of 6 molts in their lifetime.

4. Molting is a significant feature of the silkworm's growth process. The silkworm's body changes every time it molts. Silkworms molt 4 times in the larval stage and 2 times in the pupal stage (inside the cocoon), for a total of 6 molts in their lifetime.

5. 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.

6. What is the growth process of silkworms?

The growth process of silkworms:

Silkworm eggs → hatch into silkworm larvae → eat mulberry leaves and grow into adults → spin silk and make cocoons → turn into silkworm pupae in the cocoons → turn into silk moths after half a month → male and female silk moths mate and lay eggs and die within a few days (even if they do not mate or lay eggs, they will die within a few days).

7. What are the five stages of silkworm growth?

Sericulture is generally divided into five processes, namely silkworm eggs, silkworm ants, mature silkworms, silk cocoons and silkworm moths.

The outer layer of the silkworm egg is a hard eggshell, and the inner layer is yolk and serosal membrane; the ant silkworm is hatched from the silkworm egg, with many fine hairs, very small, and looks a bit like an ant; the mature silkworm is the larvae that have developed to the last stage, gradually stop eating mulberry, and the silkworm body shrinks and becomes slightly transparent; the silkworm cocoon is the cocoon of the silkworm, the sac-shaped protective layer of the silkworm pupae; the silkworm moth is formed in the cocoon, shaped like a butterfly