"Growth Changes of Silkworms" Animal Life Cycle PPT

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"Growth Changes of Silkworms" Animal Life Cycle PPT

Part One: Communicating the growth changes of silkworms

What changes happened to the little silkworm? Share your silkworm raising experience with your classmates.

When silkworms grow to a certain stage, they will grow new skin and replace the old skin. This is called molting. Silkworms shed their skin several times in their lifetime. Observe the process of molting of silkworms and record it in the record sheet.

During silkworm molting, the cuticle on the head will fall off first, and then the body will squirm, and the old skin on other parts of the body will shed back. This is the process of silkworm molting.

PPT on the growth changes of silkworms, part 2: observing the appearance and behavior of silkworms

The little silkworm has grown big and strong. Let's observe it carefully.

What does a silkworm look like?

What do the head, thorax, abdomen, and feet of a silkworm look like?

What could the small black spots on the sides of the silkworm's body be? Guess what it does.

How do silkworms eat mulberry leaves? What do the mouthparts of silkworms look like?

What do silkworms use to crawl and how do they crawl?

What is the relationship between the silkworm's body structure and its life?

PPT on the growth changes of silkworms, the third part: What else will silkworms grow into?

When silkworms stop eating leaves and their bodies turn yellow and shiny, they are about to spin silk and form cocoons. Before the silkworm spins silk, build a small shelf for it, or make a small grid with paper so that it can form a cocoon there.

Observe the changes of silkworms before and after spinning, as well as the process of spinning, and record them in the record sheet.

The process of silkworm spinning

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.

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For more information about the PPT courseware "The Life Cycle of Animals and the Growth and Changes of Silkworms", please click the "The Life Cycle of Animals and the Growth and Changes of Silkworms" ppt tag.

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Update Time: 2024-09-30

This template belongs to science courseware Third Grade Science Volume 2, Textbook Edition industry PPT template

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