CATDOLL : CATDOLL: What is the order of growth of silkworms?

1. 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).

2. What are the four stages of a silkworm’s life?

The life cycle of a silkworm is from egg to larva, and then from larva to pupa.

, and then from the pupa to the adult, these four stages are metamorphosis insects.

Silkworm eggs: Silkworms reproduce by 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.

3. What is the order of the process of a silkworm breaking out of its cocoon and becoming a butterfly?

Silkworms do not turn into butterflies, they turn into moths.

The growth process of silkworms is divided into four stages: egg, larva, pupa and adult. The silkworms that have just hatched from eggs are black and look like ants. They are covered with fine hairs, which will become less obvious after about two days. Silkworms feed on mulberry leaves. After eating mulberry leaves continuously, their bodies will gradually turn white, and they will begin to shed their skin after a period of time.

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.

4. What are the four stages of a silkworm’s life?

The first stage is hatching. The silkworm eggs are similar in appearance to white sesame seeds. As they slowly change, the silkworm babies will emerge from the eggshells, resembling small ants and are called mosquito silkworms.

The second stage is growth. The ant silkworm starts to eat mulberry leaves and slowly turns white. After four moltings, it grows into a larva and is ready to spin silk.

The third stage is cocooning. The silkworm needs two days to spin silk to make a cocoon and then turn into a pupa inside the cocoon.

The fourth stage is the adult. After about ten days, the silkworm breaks out of the cocoon and becomes an adult. It mates in a short period of time, lays sperm and eggs, and then gradually dies.

5. What is the sequence of changes during a silkworm’s life?

The life of a silkworm: eggs laid by silkworm moths → hatching → cocoons and pupae → moths, completing the cycle of a new generation. This is the life history of a silkworm.

Silkworm eggs: Silkworm eggs look smaller than sesame seeds, and are round and flat. A female moth can lay 400 to 500 eggs. Silkworm eggs are light yellow when they are first laid, and turn into light red bean or red bean color after 1 to 2 days, and then turn into gray-green or purple after 3 to 4 days, and then they will not change again. Hatching silkworms is a bit like hatching chicks. When we were young, we usually put silkworm eggs in the pockets of our clothes and use our body temperature to accelerate the hatching. We would take them out and have a look when we had nothing to do. Silkworm eggs are like chicken eggs, with a hard shell on the outside, and yolk and serosal membrane inside. The embryo in the fertilized egg continuously absorbs nutrients during the development process, and gradually develops into an ant silkworm, which breaks out of the egg shell.

Ant silkworm: When the silkworm emerges from the eggshell, it is very thin 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 thick. It will eat mulberry leaves 2 to 3 hours after crawling out of the eggshell.

Silkworm sleep: Silkworms eat a lot of mulberry, and the faster they eat, the faster they grow. When their body color gradually fades and their appetite gradually decreases until they completely fast, they will spit out a small amount of silk, fix their abdominal feet on the silkworm seat, raise their head and chest, and stop moving, as if they are asleep. This is silkworm sleep. The sleeping silkworm may seem motionless on the outside, but it is preparing to shed its skin inside. After shedding the old skin, the silkworm's growth enters a new stage, and it sheds four times from ant silkworm to spinning silk cocoon. Having a dormant nature is one of the growth characteristics of silkworms.

Silkworm age: from the first molt to the first molt is the first age; after waking up from sleep, it enters the second age; after molting again, it enters the third age; after the third molt, it enters the fourth age, and the fourth molt is the long sleep. After the long sleep, it enters the fifth age. The fifth-age silkworms grow very fast. The longest silkworm we raised this time reached 8 cm.

Mature silkworms: When silkworms reach the end of the fifth instar, they gradually show the characteristics of maturity: first, the feces they excrete clearly change from dark green to leaf green; their appetite decreases, and the amount of mulberry food they eat drops significantly; their chest becomes transparent; their bodies turn a little yellow, and 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. These silkworms are called mature silkworms.

Cocooning: After the silkworms are mature, they are placed in a special container or on a cocooning device, and the silkworms will spin silk and spin cocoons. (The cocooning device is the place for making cocoons. Some branches or chopsticks can be used to make a #-shaped or trident frame.) The process of silkworm cocooning is roughly as follows: the mature silkworms find a good place to make cocoons, first spin out silk, and stick it on the cocooning device to form a cocooning frame, that is, a cocooning net. Continue to spin out messy silk circles to thicken the inner layer of the cocoon net, and then spin silk in an 8-shaped manner, and the outline of the cocoon begins to appear, forming a cocoon coat. After the cocoon coat is formed, the cocoon cavity gradually becomes smaller, and the silk continues to be spun to thicken, which begins the process of forming a cocoon layer. When the silkworm's body is greatly reduced due to spinning a large amount of silk, a loose and soft cocoon silk layer is finally formed, which is called the pupa lining.

Silkworm pupa: About 4 days after the silkworm makes a cocoon, it will turn into a pupa. 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: The silkworm moth that emerges from the cocoon loses its ability to fly because of its two pairs of small wings. 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, after mating for half a day, the female moth can lay fertilized eggs. After mating, the male dies, and the female moth can lay about 500 eggs in one night, and then slowly dies.

6. What are the four stages in the life of a silkworm?

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.