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From where does silk come from? Explain with the help of a diagram.
Silk is obtained from the silkworm.
The egg is the first stage of a silkworm’s life cycle. Adult moths mate with each other then the female moth lays an egg about the size of an ink dot during summer or the early fall.
The caterpillar or larvae are hatched from the eggs of the silk moth. The young silkworms can only feed on tender mulberry leaves. As they grow, they shed all their hair and gains a smooth skin and give rise to pupa.
In the pupa stage, the silkworms spin a protective cocoon around themselves which serves as protection for the pupa.
The silk thread (yarn) is obtained from the silk moth’s cocoon.
If the silkworms are allowed to evolve and break through the cocoon, then silk would be useless for commercial purposes. So, the embedded insect has to be plunged into boiling water to kill the pupa and dissolve the glue holding the cocoon together.
Then the cocoon is unwound and ready to spindle to make it into thread.
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