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

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 is the growth process of silkworms?

The life of a silkworm goes through the process of silkworm eggs, ant silkworms, mature silkworms, silkworm cocoons, and silkworm moths, which takes more than 40 days. The specific process is as follows: 1. Silkworms reproduce with eggs. Silkworm eggs look like fine sesame seeds, about 1 mm wide and 0.5 mm thick. When the temperature rises, the silkworm eggs begin to develop. After 7-15 days, when the silkworm eggs become transparent and the outline inside can be seen, it means that the silkworms are about to come out! 2. The silkworms that have just hatched from the eggs are black like ants. We call them "ant silkworms". They are covered with fine hairs, which will not be obvious after about a few days. Silkworms have an appetite about 40 minutes after hatching, and the feeding process should begin at this time. 3. Silkworms live on mulberry leaves. After eating mulberry leaves continuously, their bodies turn white, and they begin to shed their skin after a period of time. Silkworms do not eat or move when they sleep. They seem to be sleeping, but they are actually shedding their old skins and replacing them with new ones to continue growing. During the whole breeding process, the silkworm will molt 4 times. Each time it molts, it will not eat or move. Try not to disturb it at this time, and don't throw it away thinking it is sick. Each dormancy period of the silkworm lasts about one day. 4. After molting once, it is the second-instar larva. It will be one year older each time it molts. It will molt four times in total and become a fifth-instar larva before it starts to spin silk and make cocoons. 5. Generally, it starts to make cocoons around 25 days. When the silkworm's back is shiny, yellow and transparent, it means that it is about to spin silk and make cocoons. At this time, a cross space should be provided for the silkworm to make cocoons. It takes two days to form a complete cocoon, and complete the last molting in the cocoon to become a pupa. 6. About ten days later, it will become a silk moth and break out of the cocoon. After the cocoon, 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 about one night, and then it will slowly die. Living habits Silkworms are oligophagous insects. In addition to mulberry leaves, they can also eat mulberry leaves, elm leaves, grape leaves, scorzonera, dandelions and lettuce leaves, but eating these will increase the mortality rate. The nutrients necessary for silkworms include protein, carbohydrates, lipids, vitamins, inorganic salts and water. Mulberry leaves are the most suitable natural food for silkworms. After eating mulberry leaves, the larvae grow rapidly. Under suitable temperature conditions, a silkworm molts once every 6-9 days from hatching to spinning cocoons, which takes about 24-32 days in total. It eats about 20-30g of mulberry leaves (5-6.2g of dry matter). Generally, after four dormancy and molting, the weight increases by about 10,000 times when it grows to the extreme. Spinning silk and making cocoons is an instinct of mulberry silkworms to adapt to the environment and survive. Mulberry silkworm cocoons can be reeled into silk, which is a precious textile raw material and is also widely used in military industry, electrical engineering and other fields. Silkworm pupae, moths and silkworm feces can also be used comprehensively. They are raw materials for many chemical and pharmaceutical industries, and can also be used as nutrients for plants. Silkworms are holometabolous insects. In one generation, they go through four developmental stages: egg, larva, pupa, and adult. The number of generations that occur naturally in a year is called diapause. One generation in a year is called monopodialism, two generations in a year is called dipodialism, and three or more generations in a year are called polypodialism. There are also polypodial species in tropical areas that do not diapause all year round. The temperature range for development varies with the development period, generally between 7 and 40 degrees Celsius, and the temperature range for normal development is 20 to 30 degrees Celsius.

3. What are the methods to record the life of a silkworm?

First, it is the most primitive method of writing records: the advantage of this method is that it can trace the origin of silkworms, record the growth process of silkworms throughout their lives, do a good job in silkworm growth analysis, and describe the whole process in detail; second, the video recording method: this method is to set up filming equipment in the silkworm house. The advantage is that the growth process of the silkworm can be intuitively understood; third, the picture recording method: take pictures of the growth process of the silkworm in stages and steps or at fixed points and times, and then arrange these works in chronological order for people to refer to and understand. The advantage of this is that it is more casual and easy-going.

4. What are the methods for recording the growth changes of silkworms?

Here’s how

1) Video method: Use a mobile phone or camera to record the growth and changes of silkworms. Show key stages, such as molting, cocooning, cocoon breaking, egg laying, etc.

(2) Photo method: Use a mobile phone or camera to take photos and organize them.

It can intuitively present the characteristics of silkworms in different stages, such as the characteristics of silkworm larvae, silkworm eggs and cocoons, etc.

(3) Drawing method: Use simple diagrams and pictures to record the life of the silkworm.

For example, drawing the shapes of silkworm eggs, larvae, pupae, and adults.