How is silk obtained from a cocoon class 6th? Answer: Cocoons of silk moth are used to obtain the silk fibres. The silk fibres is then separated.
How is silk separated from the cocoon?
This helps in separating out the silk fibres. The process by which silk thread is separated from the cocoon is called reeling the silk. Then, the spinning of silk fibres into threads is done. Similarly, how is silk obtained describe in brief?
What is the function of cocoons in silk production?
The cocoons having developing silkworms inside them are used to obtain silk. Some of the silkworms (as pupae) are allowed to live and mature into silk moths so that they can lay eggs to produce more silkworms. Mulberry is called shehtoot.
Do you have to boil cocoons to make silk?
Note: It must be kept in mind that about 1 per cent of the total harvest of cocoons is not boiled. The insects within the cocoons are allowed to mature to form silk moths. These silk moths cut through the cocoons and are allowed to breed silkworm eggs for the future production of silk.
Why don't we get silk from insect cocoons?
Because we cannot get silk when it is an insect . when it is in a cocoon it is boiled to take the silk which is derieved only from the thread like substance by which a cocoon is formed . Because they produce thin thread like structure which is know as slik .
Q.1. How to obtain silk from the cocoon
Ans: The breeding and management of silk moths for the production of silk involve the following steps: 1. Silk moth eggs are preserved on cloth or...
Q.2. How to spin silk from a cocoon
Ans: The process of “spinning” silk is similar to the spinning of cotton yarn. The silk yarn is given desired twists to obtain silk of desired stre...
Q.3. How to remove silk from cocoons
Ans: The process of taking out threads from the cocoon is called reeling the silk. This is done by special machines. The fibres of the cocoon are t...
Q.4. Why are cocoons killed to get silk?
Ans: The cocoons are first boiled in hot water to kill the larvae inside. The hot water softens the silk gum sericin to allow the unwinding of silk...
Q.5. What are the properties of silk?
Ans: The few properties of silk are 1. It is a bad conductor of heat. 2. It is very elastic, thus resists creasing. 3. It is resistant to dust. 4....
Q.6 What are the uses of silk?
Ans: Silk is commonly used to make expensive dresses for men and women, which are worn on special occasions. In India, most of the silk is used in...
What is the process by which silk thread is separated from the cocoon called?
The process by which silk thread is separated from the cocoon is called reeling the silk. Then, the spinning of silk fibres into threads is done. Click to see full answer.
Why can't we get silk from cocoons?
Subsequently, one may also ask, is obtaining silk from cocoon is in human give reason? Because we cannot get silk when it is an insect . when it is in a cocoon it is boiled to take the silk which is derieved only from the thread like substance by which a cocoon is formed .
How do silk moths come out of cocoons?
When the silk moth come out of cocoon by cutting the cocoon, this continuity is lost, making it impossible to reel the cocoon. In order to prevent this, a practice called stifling is practiced wherein, the pupa inside the cocoon is killed before emergence of moth by using hot air or steam or even sun drying. Similar Asks.
How do silkworms get silk?
In order to obtain silk, mulberry trees are cultivated, silkworms are reared and their cocoons are collected to get silk fibres. When the eggs hatch, silkworms come out of the eggs. The silkworms are fed mulberry leaves. After 25-30 days, the silkworms stop eating and get ready to spin cocoons.
How is silk formed?
Silk is formed in liquid form in the two glands in the silkworms’s head. (3) When the silkworm (or caterpillar) is ready to enter the next stage of its development called pupa, it first weaves a net to hold itself. Then it swings its head from side to side in the form of figure of eight.
Where does silk come from?
Natural silk is obtained from the cocoons of silkworms and it is made of a ‘protein’. Natural silk is an animal fibre. Artificial silk (called rayon) is obtained from wood pulp and it is made of modified plant material ‘cellulose. (Paper is also made of cellulose obtained from wood pulp).
How does a silkworm develop?
The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth. (4) When the pupa (encased in cocoon) develops fully to form an adult silk moth, then the cocoon splits up and a beautiful silk moth comes out. The adult female silk moth then lays more eggs.
How does a silkworm's head work?
During these movements of head, the silkworm secretes silk in liquid form through the tiny opening in its head which solidifies on exposure to air and becomes a silk fibre (or silk thread). Soon the silkworm (or caterpillar) covers itself completely by silk fibres. The silky covering spun by the silkworm ...
Why does a silkworm get killed?
This is because if the silkworm (as pupa) is allowed to mature into a silk moth, then the fully formed silk moth secretes a liquid to dissolve a part of silk of the cocoon to break it so as to come out of it and fly away.
Why is cocoon made?
The cocoon is made by silkworm to protect its development as pupa. Pupa is a stage in the life history of silk moth when the caterpillar (or silkworm) becomes ‘encased’ in a hard shell of silk fibres called cocoon. The silkworm continues to develop in the form of pupa inside the cocoon to form the silk moth.
What is silk fiber made of?
Silk fibre is made of a protein. The soft looking silk yarn is as strong as a comparable thread of steel. Silk fibres are converted into silk yarn which is used for making silk cloth. The rearing of silkworms for obtaining silk is called Sericulture.
