"The Life Cycle of Silkworms" The life cycle of animals PPT download

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"The Life Cycle of Silkworms" The life cycle of animals PPT download

Part One: Importing New Knowledge

Looking back on our sericulture process, think about what processes a silkworm has gone through in its life?

Silkworm life cycle PPT, part 2: new knowledge explanation

1. The life of Xiaojie Silkworm

How many stages does a silkworm go through in its life? What are the differences in form and behavior among the various stages?

How many forms does a silkworm go through in its life? What are the differences?

Make a short summary:

The silkworm that comes out of the egg is the larvae of the silkworm, and the silkworm moth is the adult of the silkworm. Silkworms go through four forms in their life: eggs, larvae, pupae and adults.

2. Life cycle of silkworm

The ant silkworm hatched from the silkworm egg is the beginning of the silkworm's life cycle. When the silkworm reaches a certain stage of growth and development, it will form a cocoon and turn into a pupa. When the pupa develops into a moth, the moth will crawl out of the cocoon, and then the silkworm moths will mate and give birth. The death of eggs and silkworm moths is the end of silkworm life.

3. What factors affect the life and changes of silkworms?

group discussion:

What conditions do silkworms need to maintain their lives throughout their life cycle?

Temperature, humidity, light, food and pest control.

Silkworm life cycle PPT, part 3: knowledge expansion

Tips: Tips on raising silkworms

1. From silkworm ants to silkworm babies:

Suitable temperature: 20-25℃, incubation time: 2-3 days.

Recruiting ants: The small silkworm will emerge from the egg shell like an ant, and use very light gestures to attract it to the young leaves.

Note: Silkworm eggs need to be kept ventilated and protected from light during incubation.

2. Feed silkworm babies:

The living habits of silkworm babies are: sleep when they are full and eat when they wake up;

Living environment: plastic or wooden flat box,

Note: The mulberry leaves should be fresh. You can also collect a plastic bag each time, use a few pieces every day, and sprinkle some water on the rest to keep them fresh in the refrigerator. The collected leaves will have a certain amount of dust, so they can be washed and dried. They must be dried, otherwise small or large silkworms will have diarrhea after eating them.

3. Silkworms spin silk and form cocoons:

Molting: After one molt, the larvae is the second instar. The larvae will be one year older after molting once. It will molt four times in total.

Cocooning: 7-8 days after the 4th molt, no longer eat mulberry leaves, the body starts to shine, and it starts to look for a suitable position to start cocooning.

Note: Place something supportive in the silkworm box to help the silkworms make cocoons.

Silkworm life cycle PPT, Part 4: Consolidation exercises

Do it, talk about it

1. Fill in the blanks

1. What comes out of the egg is the silkworm, the ______ of the silkworm, and the silkworm moth is the ______ of the silkworm.

2. Silkworms go through four forms in their life: ______, ______, ______, and ______.

3. The life of a silkworm has gone through four stages: ______, ______, ______, and ______. This whole process is the ______ of the silkworm.

2. Multiple choice questions

1. Silkworms only eat food in the ( ) stage.

A. Egg stage B. Larva stage C. Pupa stage D. Adult stage

2. The life cycle of silkworm is about ( ) days

A.20 B.56 C.78

3. The factors that affect the survival of silkworms are ( )

A.Food B.Temperature C.Disease D.All of the above

Silkworm life cycle PPT, Part 5: Class summary

What did you learn in this lesson?

1. A silkworm goes through four forms in its life: silkworm eggs, silkworms, pupae, and silkworm moths.

2. Silkworms are the larvae in the life cycle of silkworms, and silkworm moths are the adults of silkworms. Silkworm moths die after mating and reproduction.

3. The life of silkworms goes through four stages: birth, growth and development, reproduction, and death. This is the life cycle of silkworms.

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

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Update Time: 2024-09-29

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

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