"What Became the Silkworm Chrysalis" PPT Courseware 2

"What Became the Silkworm Chrysalis" PPT Courseware 2

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.

Generally speaking, one may think that silkworms are resting in their pupae. In fact, major structural changes are taking place in the body of the pupa. On the one hand, the body in the larval stage is destroyed, and on the other hand, the body of the moth is created. The amazing thing is, they all happened at the same time.

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.

Body structure of silkworm moth

The pupa is in the cocoon and emerges after 10 to 15 days of emergence. But when wings grow, they are unable to fly because they are not fully developed. The silk moth is in the adult stage, with its body divided into three parts: head, thorax and abdomen. The whole body is densely covered with white scales, and the head has a pair of comb-like antennae.

Male silk moths have smaller bodies and slightly larger antennae;

The female moth has a larger body but slightly smaller antennae.

The male moth uses his antennae to smell the presence of the female moth and then performs the wedding ceremony. Silkworm moths will not change anymore, they are the father and mother of silkworms.

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"What Became the Silkworm Chrysalis" PPT Courseware 3:

"What Became the Silkworm Chrysalis" PPT Courseware 3 What changes happened in the silkworm cocoon? What has become of the pupa? 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 of a male silkworm baby is...

"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...