CATDOLL : CATDOLL: What are the four parts of the growth process of silkworms? (What are the four parts of the growth process of silkworms?)

1. 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.

2. What is the growth process of silkworms?

The growth process of silkworms is divided into four stages: egg, larvae, pupa and adult. 1. The silkworms hatch. The silkworms that have just hatched from the eggs are black and are called "ant silkworms". They are covered with fine hairs, which will no longer be obvious 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 has shed its skin once, it is the second-instar larva. It will age one year after each molting, and it will molt four times in total before it becomes the fifth-instar larva and starts to spin silk and make cocoons.

4. It takes a five-year-old silkworm larva two days and two nights to make a cocoon, and it sheds its skin 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 attract the male for mating. The male dies after mating. The female moth can lay about 500 eggs in about one night, and then slowly dies.

3. What are the four stages in a silkworm’s life?

The silkworm's life cycle consists of four stages: egg, larva, pupa, and adult. Silkworms eat a lot of mulberry, so they grow very fast and their body color gradually fades.

But its appetite gradually decreases and it even stops eating completely. It spits out a small amount of silk, fixes its abdominal feet on the silkworm seat, raises its head and chest, and stops moving, as if it is asleep. This is called "sleeping".

4. 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.

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

The four changes that a silkworm goes through in its life are: first, egg, second, silkworm, third, pupa, and fourth, butterfly. The four forms are different, which is really amazing! It also gives us a profound revelation: in this world, the same thing will appear in front of us in completely different forms at different times, so when we analyze and solve problems, we must pay close attention to the period and form of things.

6. 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.

7. What are the four stages of a silkworm’s life? How many days does a silkworm’s life cycle last?

After the four stages of egg-larva-pupa-adult, its development is incomplete metamorphosis. How long does it take for silkworms to go through each stage: The growth and development of silkworms are related to temperature, humidity, food, etc., and the accelerator period is generally ten to eleven days. The larval stage is about twenty-five days (specifically, 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. The moth stage is three to five days. After the silkworm moth emerges, it no longer eats, and its wings will harden after about an hour. After the wings harden, it will mate. Each female moth will lay about 300 to 400 eggs. The purpose of silkworms emerging into moths is to mate and lay eggs.

8. 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.