please give me a life sketch of a silk worm with diagram

 

The Silkworm (Bombyx mori) is the caterpillar of a moth whose cocoon is used to make silk; it is not a worm at all. This insect is also called the silkworm-moth and the mulberry silkworm. It is native to Northern China.

Silk: The silk from the silkworm's cocoon is a single, continuous thread. It is made of a protein that is secreted from two salivary glands in the caterpillar's head. The Chinese have harvested silk from silkworm cocoons for thousands of years. To harvest silk, the silkworm is allowed to spin its cocoon and it is then put in boiling water to kill the pupa and help unravel the thread. Each cocoon contains a single silk thread that is about 300 to 900 meters long. The silkworm has been domesticated to the point where it could no longer survive in the wild. The adult moth cannot eat or fly; it has a fat body and small wings.

Lifecycle: The tiny Silkworm larva hatches from a tiny black egg. The larva eats mulberry (Morus alba) leaves almost constantly for 4 to 6 weeks until it is 2 3/4 inches long. The white caterpillar molts its skin many times during this stage. The caterpillar then pupates; it spins a white silk cocoon around itself (in a process taking 3 or more days). The silk covers a hard brown-shelled pupa. In roughly three weeks, the adult moth emerges. This white moth cannot fly; it reproduces and dies within about five days (the female lays from 200 to 500 lemon-yellow eggs that eventually turn black).

Classification: Class Insecta (insects), Order Lepidoptera (butterflies and moths), Suborder Ditrysia (Moths, Butterflies, Skippers), Superfamily Bombycoidea, Family Bombycidae, Genus Bombyx, Species B. mori.

answer

 thanks everyone for helping me!

then they turn to moths!!!!

Silk is an animal fibre, which is obtained from silkworms that live on mulberry trees. The rearing of silkworms to obtain silk is known as sericulture. During a stage of its life cycle, the silkworm weaves a net around itself. Silk is then obtained from this net. To get an insight of this process, we will first study the life cycle of a silkworm.

The life of a silkworm starts when a female moth lays eggs on the mulberry leaves. After sometime, these eggs hatch into larvae. These larvae are known as caterpillars or silkworms. Slowly these caterpillars grow in size by feeding only on the leaves of mulberry trees.

The next stage in the life cycle of a silkworm is a pupa. When the caterpillar has grown large enough and is ready to go to the stage of pupa, it starts weaving a net around itself to hold itself. Then, it moves its head from one side to another, making a figure eight (8). During these movements, caterpillars secrete a fibre made of protein, which solidifies and hardens when exposed to air for some time. This is the silk fibre. Caterpillars continue to spin silk fibre till they completely get covered by these fibres. This silk covering in which a silkworm covers itself is known as a cocoon. Further development of the silkworm takes place inside the cocoon, and it enters the pupa stage. After sometime, the pupa enters into the adult stage and emerges out of the cocoon as a moth. The whole process thus continues and is known as the life cycle of a silkworm.

Silk isan animal fibre, which is obtained from silkworms that live on mulberry trees.The rearing of silkworms to obtain silk is known as sericulture. During a stage of its life cycle, the silkworm weaves a net around itself. Silk is then obtained from this net. To get an insight of this process, we will first study the life cycle of a silkworm.

The life of a silkworm starts when a female moth lays eggs on the mulberry leaves. After sometime, these eggs hatch into larvae.These larvae are known as caterpillars or silkworms.Slowly these caterpillars grow in size by feeding only on the leaves of mulberry trees.

The next stagein the life cycle of a silkworm is apupa. When the caterpillar has grown large enough and is ready to go to the stage of pupa, it starts weaving a net around itself to hold itself. Then, it moves its head from one side to another, making a figure eight (8). During these movements, caterpillars secrete a fibre made of protein, which solidifies and hardens when exposed to air for some time. This is thesilk fibre. Caterpillars continue to spin silk fibre till they completely get covered by these fibres. This silk covering in which a silkworm covers itself is known as acocoon. Further development of the silkworm takes place inside the cocoon, and it enters the pupa stage. After sometime, the pupa enters into the adult stage and emerges out of the cocoon as a moth. The whole process thus continues and is known as the life cycle of a silkworm.