Silkworms create cocoons if they have enough food to eat. To explain more, Silkworms are the larvae of an Asian moth (Bombyx mori) that spins a cocoon of fine, tough, glossy fiber that is used to make commercial silk. Sericulture is the cultivation of silkworms. The quality of the silk produced by the various species grown nowadays distinguishes them. Silkworms eat the leaves of mulberries (genus Morus) and occasionally Osage oranges (Maclura pomifera). Because Bombyx Mori does not bite, it is an excellent worm for feeding most reptiles, amphibians, and other animals. As a live feeder, they also provide excellent nourishment. Most infant reptiles can eat newborns, and young silkworms can even be fed in order to develop to a specific size. Silkworms have a soft body, move slowly, and can grow to be 3 inches long. They also grow quickly, reaching about 3 inches in length and being ready to cocoon in as soon as 25 - 28 days. Silkworms, like other insects, go through four phases of development: egg, larva, pupa, and adult. A life cycle diagram can be found by clicking here. The silkworm moth is in its adult (imago) stage. The caterpillar is the larva (not really a "worm" at all). After spinning its cocoon, the silkworm transforms into a pupa before emerging as a moth. Because the silkworm grows so quickly, it must shed its skin four times during its life. These stages-within-stages are known as instars. 
Why are cocoons steamed?
The answer to why cocoons are steamed might be interesting to you. To destroy the pupae inside cocoons prior to commercial silk harvesting, steam is applied. This is so that if the silkworm started to emerge as a moth, it wouldn't destroy the silk. The silk binding coating is then broken down by soaking the cocoon in hot water rather than tea. The single strand that makes up each cocoon is then unraveled by a machine. These strands are twisted together to create the delicate thread needed to weave silk fabric. To obtain silk fibers, cocoons must be boiled. We can readily separate the silk fibers after boiling them, yielding lengthy strands of continuous silk thread. The adhesive holding the fibers together can be removed from the cocoon by boiling it. If the cocoon isn't boiled, the fibers will be fragile and we won't get a long, continuous silk thread; instead, we'll get fragments of the thread. Furthermore, it couldn't be spun into a thread. 
How long can silkworms go without food
How long silkworms can go not eating food might be interesting to you. Or if you have it as a pet wanting to you how long they can survive without eating, you can read this article to know more about it. Small Silkworms eat less than older worms. At least once every day, leaves should be added. When the Silkworms reach full size, feed them two to three times every day. Feed them once in the morning, once in the afternoon, and once in the evening (if it's a hot day and the leaves wilt, rotate them more regularly). It is possible for them to go a week or more without eating (depending on temperature and size). However, feeding them every couple of days will keep them hydrated and healthy, extending the "hold" period. Q- 7. 
Where do silkworms live
Silkworms are very specialized feeders. It only consumes the leaves of mulberry trees. Because the silkworm has been domesticated in order for its cocoons to be extracted and used to manufacture silk fabric, it no longer lives in the wild and must rely on man-made habitats to thrive. Experts in silkworm farming, or sericulture, argue that silkworms that feed on the leaves of white-fruited or black-fruited mulberry trees make the best silk. Silkworms will flourish on a carefully developed artificial meal if mulberry leaves are not available. According to the University of Arizona's Center for Insect Science Education, a silkworm cocoon is made up of a single strand that is over 900 meters (nearly 3,000 feet) long. One pound of silk requires approximately 300 cocoons. To kill the worm inside, the cocoons are heated in furnaces, boiled, or dried in the hot sun. The cocoons are then meticulously unwound and joined with strands from other cocoons to form a single silk thread. You might want to have a silkworm as a pet. It's as simple as putting mulberry tree leaves in a cardboard shoe box to make a silkworm house. Keep plenty of fresh mulberry leaves on hand for your silkworms, since they eat enough to become 10,000 times heavier than when they hatched. 
How big do silkworms get
Have you ever wondered how big silkworms get? Do you want to know how to make your silkworms a bit chubbier? In this article, we will tell you how. Silkworm moth is a lepidopteran whose caterpillar has been employed in silk manufacture (sericulture) for thousands of years. Although native to China, the silkworm has been transported all over the world and has been completely domesticated, with the species no longer being found in the wild. Since ancient times, the larva of the silkworm moth (Bombyx mori), a lepidopteran, has been employed in sericulture to produce silk. Although a native of China, the silkworm has been widely introduced and fully domesticated, and the species is no longer found in the wild. A mature silkworm has a thick, bristly body and wingspan of 40 to 50 mm (about 2 inches) (the adult female is larger than the adult male). It usually has narrow black stripes going throughout the body and is blond to light brown in color. The wings are cream in color with dark veins that reach the edges. 
Larvae that have just emerged from the egg are about 2 to 3 mm (0.08 to 0.12 inch) length and eat voraciously. Silkworm caterpillars also consume the leaves of Osage oranges and lettuce in addition to their normal diet of mulberry leaves. A distinctive caudal horn is present on the pale larva. It grows over 45 days, reaching a maximum length of 75 mm (about 3 inches). Pupation takes place inside a cocoon, which is composed of a single, continuous strand of silk that is typically 915 meters (1,000 yards) long and is either white or yellow. The pupa is killed using hot air or steam to preserve the filament for commercial usage. Silkworms whose genomes have been genetically transformed by the introduction of spider silk genes create silk that is stronger, harder, and more elastic than silkworms raised in captivity.