how do silkworm skin cocoon
Answers
Answer:
The silk is actually hardened silkworm saliva. It comes out of the mouth, not out of the rear end like a spider. When the silkworm ate great quantities of mulberry leaves, they were digested and nutrients were sent into the bloodstream. The silk glands absorbed these nutrients. The larva has a small spinneret on its lip, through which the silk emerges. The single strand of silk that forms the cocoon is about one mile long!
The silkworm moves its head in figure 8 patterns as it spins the cocoon. When the cocoon is partially made, you can see the head moving around inside if you hold it up to the light as shown at the left.
Finished cocoons are opaque and about two inches long. Silkworm farmers place cardboard grids near the silkworms. The silkworms spin their cocoons inside these frames.
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Answer:
see stage 3
Explanation:
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Stage 1: Egg
An egg is the first stage of the life cycle of silkworm. The egg is laid by a female moth which is mostly the size of small dots. A female moth lays more than 350 eggs at a time.in the springtime, the eggs hatch due to the warmth in the air. This procedure happens once in every year.
Stage 2: Silkworm
A hairy silkworm arises after the eggs crack. In this stage of silkworms, the growth happens. they feed on mulberry leaves and consume a large amount of these leaves for around 30 days before going to the next stage.
Stage 3: Cocoon
In this stage, silkworms spin a protective cocoon around itself. It is the size of a small cotton ball and is made of a single thread of silk.
Stage 4: Pupa
Pupa stage is a motionless stage. In this stage, people kill the pupa by plunging the cocoon into boiling water and unwind the silk thread.
Stage 5: Moth
In this stage, the pupa changes into an adult moth. The female moth lays eggs after mating and thus the life cycle of silkworm begins again.