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"Silkworms Build a New House" PPT courseware
Silkworm spins silk and creates cocoon
How is your silkworm baby looking? What's new?
Is my silkworm baby sick? It doesn't seem to want to eat mulberry leaves.
The same goes for my silkworm babies.
When they grow to a certain extent, the silkworm babies no longer eat food. Observe the silkworm carefully at this time. What are the characteristics of its body?
After they stop eating, the silkworms will start to spin silk and form cocoons. DIY, use wheat straw, straw or other things to build a small frame for the silkworms to build their cocoons there.
How do silkworms spin silk and form cocoons?
The silkworm raises its head and makes 8-shaped waves continuously, covering itself with silk.
Silkworms hang themselves in the air and weave a web in the shape of a cocoon.
The cocoon becomes thicker and thicker, completely covering itself.
What will the silkworm baby look like after moving into the "new house"?
What is it doing inside?
Will it still be the same?
Maybe it will become something new.
Observing silkworm chrysalises
The body of the pupa is spindle-shaped, with a small head. There are a pair of compound eyes and a pair of antennae on the ventral surface. The body is yellow in color. You can also see that the pupa has grown a pair of wings and three pairs of legs. Cut silkworm chrysalis can still develop normally.
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"Silkworms Build a New House" PPT courseware 3:
"Silkworms Build a New House" PPT Courseware 3 Why did the silkworms make a cocoon to wrap themselves up? What did the silkworms look like after the house was built? What is the difference between the appearance of pupae and silkworms: The shape of pupae is short and short, spindle-shaped, divided into three parts: head, thorax and abdomen. The head is very small...
"Silkworms Build a New House" PPT courseware 2:
"Silkworms Build a New House" PPT Courseware 2 Reading textbook P26 related content guesses 1. Why do silkworms stop eating leaves and their bodies become yellow and shiny? The silkworms are ready to spin silk! ! 2. Before silkworms spin silk, what do the babies of silkworm farmers do? The performance of silkworm babies before spinning...