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In order to exterminate the larva, the cocoons need to be crushed…. The process of boiling cocoons in order to obtain silk fiber is referred to as reeling. After this step, the silk fibers are spun into silk thread, and then the thread is finally used for producing garments and can be colored into a variety of colors.
What exactly is the abbreviated form of cocoon class 7?
The term “cocoon” refers to the protective covering that is created from silky threads and that is used to wrap the larvae of insects such as moths and butterflies, among other kinds of insects. The cocoon is the stage of development for the larvae that will eventually become the adult insects. The stage of development known as the pupa is the one that is encased in the cocoon.
What exactly is the seventh class of sericulture?
The process of raising silkworms for the purpose of harvesting their silk is referred to as sericulture. The caterpillars of the domestic silkmoth, also known as Bombyx mori, are the silkworm species that are employed in sericulture more frequently than any other species.
What aspects of seventh grade are restrictive?
Silk cocoons are subjected to stifling treatments in order to kill the pupae inside of them. This eliminates the risk of moths emerging from the cocoons and allows the silk to be preserved for extended amounts of time. Every one of them includes subjecting the skin to hostile elements for extended periods of time, such as prolonged exposure to the sun, hot steam produced by boiling water, or hot air, for hours or even days.
What is the process that a cocoon Class 7 pupa goes through?
As soon as the caterpillar realizes that it is almost time for it to transform into a pupa, it begins to spin a web to support itself and moves its head in a figure eight pattern…. Eventually, the caterpillar will become a cocoon. A cocoon, also known as a coating of silk fibers, is quickly formed by the caterpillar and covers its entire body.
పట్టు కాయల స్టిఫ్లింగ్ ,Stiffling of silk cocoons. 24th page of the 7th class’s third lesson
42 questions found in related categories
What process is used to extract silk from a cocoon of Class 6?
Collecting cocoons and storing them in the open air is one method, while others include boiling or subjecting them to steam. This assists in the process of separating the silk fibers. Reeling the silk is the term used to describe the process of extracting the thread of silk from the cocoon. After that comes the process of spinning the silk fibers into threads.
What exactly is meant by shearing class 7?
(ii) Shearing refers to the process of removing the fleece of a sheep together with a thin layer of skin from the animal. Shearing is also known as “shearing.” In order to harvest wool, the sheep’s coat of hair must first become sufficiently dense before it can be sheared. Shearing is the process of removing the thin covering of skin and wool from the top of a sheep before cutting off the woolly fleece.
What is the Class 7 technique of reeling the silk called?
Reeling the silk refers to the process of extracting strands from the cocoon so that they can be processed into silk. Reeling is accomplished by using specialized machinery that unwind the silk threads or fibers that have been extracted from the cocoon. The silk fibers are then transformed into silk threads, which are subsequently used by weavers to create silk fabric.
What does it mean to stifle something?
Definition of stifling in the English language: in a manner that is oppressively stuffy and unpleasant: This place is boiling hot all the way through. The apparatus may be put under stress when there are violent storms and extremely high temperatures. Additional examples. The temperature within the room was suffocating.
What exactly is meant by the term stifling?
causing suffocation or unpleasant closeness: the cavern had an atmosphere that was stifling.
What exactly is the seventh temperature class?
The degree to which a place or an object is warm or cool is referred to as its temperature. The sort of energy known as heat energy is the kind of energy that moves from a hot body to a cold body… Convection is a mechanism of heat transmission that takes place as a result of the bulk movement of the liquid or gas that is being heated.
What exactly do you mean when you talk about Egestion Class 7?
The term “egestion” refers to the process through which the body expels food that has not yet been digested. Food is taken into the body through the mouth. The anus is the organ through which the body expels food that has not been digested.
What kind of food does the Class 7 silkworm eat?
The pupa are produced by the silkworms after they have fed on mulberry leaves.
How does the cocoon come about?
The cocoon of the silkworm is constructed by the caterpillar through the process of creating and encircling itself with a long, continuous fiber, also known as a filament. At the chrysalis stage, steam or hot air is used to kill the larva that is contained within the cocoon by the chrysalis. This is done because an emerging moth would tear the cocoon filament.
What causes a cocoon to form?
During the stage known as “pupa,” a butterfly begins its transformation from the stage known as “caterpillar.” During this stage, the caterpillar’s old body dies and a new body forms inside a protective shell known as a chrysalis. Silk chrysalis coverings are spun by the caterpillars of many different insect species, including moth caterpillars.
What are the components of a cocoon?
Cocoons are a type of protective covering that are used by certain insects, most notably moths, to encase their developing pupae and chrysalises. Before the caterpillar or larvae pupates inside, it often spins its own cocoon out of silk that it has generated and stitched into its own body… The silk is detached from the cocoons and then weaved into threads.
What do rages mean?
1: extreme and unbridled rage; rage to the point of frenzy My blood was boiling with wrath. 2: an outburst of rage The insensitive statement triggered a fit of wrath in him. 3: violent action 4 : fad.
What exactly does it mean to be billowy?
1: to rise or roll in waves or surges the billowing sea 1: to rise or roll in waves or surges 2: to get puffed out or bloated (especially as a result of the action of the wind) billowing clouds…
What exactly is meant by the term “scavenging”?
1a(1): to free (an area) of something undesirable (dirt, garbage, etc.). (2): the act of removing dirt or garbage from: to scavenge or cleanse a roadway. b: to take in food from 2a: to eliminate (burned gases) from the cylinder of an internal combustion engine after a working stroke.
What is meant by the phrase “reeling the silk”?
The production of a single thread from multiple cocoon baves is referred to as “reeling” silk. This procedure takes place in a reeling machine. This is accomplished by unwinding filaments collectively from a collection of cooked cocoons at one end in a warm water bath and winding the resultant thread onto a rapidly moving reel. This process is repeated until the desired length of thread is attained.
What exactly is the short solution to reeling?
The method of reeling involves unwinding raw silk strand from the cocoon onto a holder directly after it has been extracted. The technique of combining and twisting multiple strands of raw silk or synthetic filament to produce yarn of a particular thickness is referred to as tossing. This can be done with either natural silk or synthetic filament.
In Class 7, what are the three different qualities of silk?
There are three primary grades of silk, which are denoted by the letters A, B, and C respectively. Grade A Silk is the highest quality of silk and is the only type of silk that can be unraveled without the silk floss breaking.
What exactly is the shearing process?
Shearing is a procedure that cuts stock without the development of chips, the use of burning or melting, and without the need to use burning or melting. Shearing is also known as die cutting. Technically speaking, the procedure is called shearing if the cutting blades are straight; if the cutting blades are curved, then they are shearing-type processes.
Does shearing cause any pain or discomfort to the sheep?
The wool of a sheep is sheared during the process of shearing, which involves cutting or shaving the wool. Shearing a sheep does not injure it in any way, just like giving it a haircut does not. The uppermost layer of a sheep’s skin is often the one that has died, and this is the layer that we remove.
How does the shearing process work?
The removal of a sheep’s fleece (also known as its hair) from its body is referred to as shearing. The animals receive a thorough bath and are then dried off before the shearing process begins. Shearing is a manual process that can be done with either clippers or scissors, and the person who is in charge of removing the fleece is known as the shearer.