make a project on Silk mouth their types and vartiy of silk produced by them
Answers
Answer:
Silk is an animal protein fiber produced by certain insects to build their cocoons and webs.
Many different types of silk are produced by a huge variety of different types of insects other than moth caterpillars. Yet none of these have been exploited for commercial purposes, though there has been basic research into the structures of such silks. Silk is most commonly produced by larvae, and thus largely limited to insects with complete metamorphosis.
In some instances, however, it is produced by adult insects such as webspinners. Silk production is especially common in the Hymenoptera (bees, wasps, and ants), and is sometimes used in nest construction. Other types of arthropod produce silk, most notably various arachnids such as spiders. The silk produced by other insects, mainly spiders, is used in a small number of other commercial applications, for example weapons, telescopes, and other optical instruments.
The commercial process of silk making is highly complex and labor intensive. The following will provide basic information on how silk is made.
[For general silk information, please visit About Silk Fabric, which covers various related subjects, such as Silk Care & Cleaning, Benefits of Silk, and Chinese Silk History.]
Sericulture
Hatching the Eggs
The Feeding Period
Spinning the Cocoon
Reeling the Filament
Types of Silk
Sericulture
Cultivation of the silkworm is known as sericulture. Although many insects produce silk, only the filament produced by Bombyx mori, the mulberry silk moth and a few others in the same genus, is used by the commercial silk industry.
[The “silkworm” is, technically, not a worm but a moth pupa. For the sake of simplicity and consistency, however, we will use the term silkworm throughout this writing.]
Hatching the Eggs
The first stage of silk production is the laying of silkworm eggs, in a controlled environment such as an aluminum box, which are then examined to ensure they are free from disease. The female deposits 300 to 400 eggs at a time.
In an area the size of your monitor screen, 100 moths would deposit some 40,000 eggs, each about the size of a pinhead. The female dies almost immediately after depositing the eggs and the male lives only a short time after. The adult possesses rudimentary mouthparts and does not eat during the short period of its mature existence.
The tiny eggs of the silkworm moth are incubated (about 10 days) until they hatch into larvae (caterpillars). At this point, the larva is about a quarter of an inch long.
Explanation: