Where does silk come from?
Silk is an expensive and beautiful piece of fabric that used to be worn by only kings and royalty in the past. It comes from the silkworm. The lifecycle of a crawling worm into a moth goes through several stages.
5 Important Stages in the Life Cycle of a Silkworm
Stage 1: The Egg
This is the first stage of a silkworm’s life cycle. The female moth lays eggs which are the size of a small ink dots! The female can lay more than 350 eggs at a time. These eggs remain dormant till springtime when the warmth in the air arouses them to hatch. This happens once a year. But due to human intervention the breeding of silkworm and hatching of eggs takes place at least thrice a year.
Stage 2: Larvae
When the eggs crack there emerges a hairy silkworm. This larva stage is the one where growth takes place. Upon hatching, a silkworm is 1/8th of an inch. They feed on tender mulberry leaves. They consume large amount of these leaves for 20 to 30 days and go through four stages of molt or skin changes. The first molt is when the silkworm sheds all its hair and attains a smooth skin.
Stage 3: Cocoon
At this stage the silkworm spins a protective cocoon around itself. It is made by a single thread of silk and it the size of a small cotton ball. This, it does to protect itself from predators. This is the stage where the second molt takes place when the lava turns into a pupa inside the cocoon.
Stage 4: Pupa
This stage is the motionless stage just before adulthood. It is at this stage when people take the cocoon and plunge it into boiling water to kill the pupa and unwind the silk thread. But if they don’t the pupa rests peacefully for 2-3 weeks after which it metamorphoses into an adult moth.
Stage 5: Adult moth
The pupa changes itself into a beautiful adult moth. These moths are flightless and do not have a mouth so they are unable to consume food. Once the adult moth comes out its sole purpose is to find a mate. Within 24 hours of mating a male moth dies while the female lays eggs and then even she dies. Thus the lifecycle of a silkworm begins again.
4 Interesting Facts about Silkworm
- Normally silkworms reproduce only once a year but in countries like India and China they can do so round the year because of the weather.
- Silkworms is the term used for the worms called Bombyx Mori.
- The salivary gland of the silkworm larvae produces the silk thread for the cocoon.
- One cocoon will contain raw silk thread of 300 to 900 meters in length.
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Here's my answer for the 'silkworm' diagram task that you can see here.
The diagrams illustrate the stages in the life of a silkworm and the process of producing silk cloth.
There are four main stages in the life cycle of the silkworm, from eggs to adult moth. The process of silk cloth production involves six steps, from silkworm cocoon to silk material.
At the first stage in the life cycle of a silkworm, the moth lays its eggs. Around ten days later, silkworm larvae hatch from the eggs; these larvae feed on mulberry leaves. Then, after four to six weeks, the larvae become covered in silk thread, and it takes between three and eight days for a full cocoon to be produced.
For silk cloth production, a cocoon is first selected and then boiled in water. After boiling, the silk thread that makes up the cocoon is unwound, and then several strands of thread are twisted together. At the fifth and sixth stages in the process, the thread can either be dyed and then woven into silk fabric, or it can be woven first and then dyed subsequently.
(176 words, band 9)