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"What Becomes a Chrysalis" PPT Download of Animal Life Cycle
Part One: Importing New Knowledge
Thinking: Students, silkworm babies will turn into pupae when they grow to a certain stage. What other changes will happen to the pupae?
With this question, let's explore the changes of the pupa - "What did the pupa become?"
What did the chrysalis become PPT, part 2: new knowledge explanation
Observe changes in silkworm cocoons
A moth emerges from the cocoon. This form of silkworm is called a silk moth.
How does the silkworm moth emerge from the cocoon?
☆The silkworm moth first spits out an alkaline juice to dissolve the sericin that adheres to the silk.
☆Then use the head and feet to push the silk apart to form a round hole, and the silkworm moth will come out of the round hole.
What did the chrysalis become PPT, part three: communication and discussion
What does a newly emerged silkworm moth look like?
The body of a newly fledged silkworm moth is moist, its wings are drooping, soft and shriveled, but it dries out quickly.
What did you discover by comparing pupae and moths?
The body structures of pupae and moths are the same, and moths develop from pupae.
What did the chrysalis become PPT, part four: expansion and extension
◆Silk moths mate soon after they emerge. Generally, the female moth can lay fertilized eggs 3 to 4 hours after mating. Egg laying can last for 2 to 3 days, and 1,700 to 2,000 silkworm eggs weigh about 1 gram. Silkworm moths leave behind offspring, which die soon after.
◆After the silkworm moth comes out of the cocoon, you need to take it off the cocoon. It is best to put it in another relatively large box to prevent the silkworm moth from laying eggs on the cocoon.
What did the chrysalis become PPT, part 5: Consolidation and improvement
Students, work together to talk about how silkworm babies develop and change.
1. Divide into groups: 4 people together;
2. Discuss within the group and write down the results of the discussion;
3. Representatives from the group speak.
What did the chrysalis become PPT, Part Six: Class Summary
1. Silkworm moth is the adult of silkworm.
2. Silkworm moths are insects.
3. Common characteristics of insects: The body is divided into three parts: head, thorax and abdomen; there is a pair of antennae on the head; and there are three pairs of legs on the thorax.
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For more information about the PPT courseware "What Becomes a Pupa in the Life Cycle of Animals", please click on the ppt label of What Becomes a Pupa in the Life Cycle of Animals.
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