The larva of Bombyx mori, commonly called a silkworm, is host specific to mulberry. The larva is the vegetative stage where growth takes place. A fertile ovum darkens to a blue-gray within a few days. The egg shell provides a protective covering for embryonic development. The egg of Bombyx mori is a very small and hard structure about the size of a pin head and resembling a poppy seed (fig. The warmth of the spring stimulates the egg to hatch. ![]() The egg remains in dormant stage until spring arrives. The female moth lays an egg about the size of an ink dot during summer or the early fall. The serial progressions of four distinct stages of development complete one generation of the species egg (ova), larvae, pupa and imago.Įgg is the first stage of a silkworm’s life cycle. The life cycle of Bombyx mori demonstrates the most advanced form of metamorphosis. The female has a larger abdomen whereas the male has a much larger pair of antennae. The moths differ in morphological features. Male and female moths are flightless and lack functional mouth parts. This insect is also called the silkworm-moth and the mulberry silkworm (fig. It is the caterpillar of a moth whose cocoon is used to make silk. Silkworms whose genomes have been genetically modified through the introduction of spider silk genes produce silk that is stronger, tougher, and more elastic than that produced by domesticated silkworms.The Silkworm, Bombyx mori produces the silk of commercial importance. This filament is preserved intact for commercial use by killing the pupa with hot air or steam. Pupation occurs within a cocoon that is made of one continuous white or yellow strand of silk averaging about 915 metres (1,000 yards) long. It attains a maximum length of 75 mm (about 3 inches) during a 45-day growing period. The pale larva has a characteristic posterior (caudal) horn. Besides its natural food of mulberry leaves, silkworm caterpillars also eat the foliage of the Osage orange or lettuce. Newly hatched larvae are approximately 2 to 3 mm (0.08 to 0.12 inch) long and have voracious appetites. Learn about bionics and understand the toughness of silk produced by several animals like the Morpho butterfly and silkworm, also a study on the bright, iridescent blue color of the Morpho butterfly See all videos for this article SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! ![]() Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives. ![]() Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.
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