"What Became the Silkworm Chrysalis" PPT Courseware 3

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"What Became the Silkworm Chrysalis" PPT Courseware 3

What changes happened in the cocoon? What has become of the pupa?

Observe silkworm chrysalis:

Weigh it, take a photo, take a look

And cut open the cocoon and observe the pupa

The size of the cocoon is related to the pupa. Generally speaking, the cocoon and pupa of a male silkworm baby will be smaller. The male pupa is at the top of the picture, and the pupa of the female silkworm baby is obviously larger at the bottom.

The front body of the silkworm chrysalis is also divided into sections.

On the abdominal surface of the silkworm chrysalis, you can vaguely see the lines and tentacles of the wings and three pairs of legs.

There are also stomata on the sides of the pupa.

Emergence of silkworm chrysalis

After about 10 to 15 days, when the pupa matures, it will shed the pupa shell and emerge into a moth. The cocoon layer near the head will be softened and the moth will be removed with the head and chest. First, you will hear a slight tearing sound, the pupa has a crack on its back, the moth head appears, and the black tentacles are busy stretching out, as if to explore this strange world first.

Silkworm moth emerges from cocoon

After the silkworm spins a cocoon, about ten to fifteen days, the pupa is ready to emerge. After the pupa emerges into a moth in the cocoon, the moth will secrete alkaline liquid from its mouth, making one end of the cocoon wet, and the moth will emerge from the cocoon. Break the cocoon here. First, it stretches out its head, then pushes forward with its feet to expose its chest and abdomen, and then the whole moth crawls out of the cocoon. At this time, the moth's wings are wet and wrinkled. The moth will flap its wings as it walks. The wings will slowly expand and expand like a balloon. The wings will harden after about an hour.

Mating and spawning

After silk moths mate, the male moth dies soon after, while the female moth continues the task of reproducing the next generation - laying eggs. The female moth does not rest when laying eggs. She can lay about 500 eggs in a day or two. After laying eggs, although the female moth has a mouth, she will no longer eat anything and will die soon. After the dead moth dries up, you can find that there is almost nothing in the abdomen by gently pressing the abdomen.

Summarize

After 10-15 days, the silkworm chrysalis will turn into a silkworm moth.

Silkworm moths are the adults of silkworms, which are divided into female and male moths. After the female and male moths mate, the female moth lays eggs to reproduce.

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"What Became the Silkworm Chrysalis" PPT Courseware 2:

"What Becomes the Silkworm Chrysalise" PPT Courseware 2 Observe the silkworm chrysalis: Weigh it, take a photo, take a look, cut the cocoon, and observe the chrysalis. The size of the cocoon is related to the chrysalis. Generally speaking, the cocoon and pupa of a male silkworm baby are relatively...

"What Became the Silkworm Chrysalis" PPT courseware:

"What has become of the silkworm chrysalis" PPT courseware What changes have taken place in the silkworm cocoon? What has become of the silkworm chrysalis? Moths are another form of silkworms during their growth and development. It has two pairs of wings, but they are short and lose the ability to fly. The body of the newly fledged silkworm moth is moist, and its wings are drooping and soft...

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Update Time: 2024-09-28

This template belongs to science courseware E-education edition third grade science volume 2 industry PPT template

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