| Category | Format | Size |
|---|---|---|
| People's Education Edition Biology for Grade 8, Volume 2 | pptx | 6 MB |
"Reproduction and Development of Insects" Reproduction and Development of Biological Organisms PPT Courseware 5
Description
"Reproduction and Development of Insects" Reproduction and Development of Biological Organisms PPT Courseware 5
teaching objectives:
1. Review the basic characteristics of insects; list common insects.
2. Understand and master the definition of abnormal development.
3. List common insects that undergo metamorphosis.
4. Definition and understanding of incomplete metamorphosis; list common insects with incomplete metamorphosis.
5. Summarize the reproduction and development methods of insects.
Teaching focus:
1. The definition of abnormal development.
2. The definition of incomplete metamorphosis.
3. The definition of complete metamorphosis.
4. Reproduction and development modes of insects.
Teaching difficulty: the difference between complete metamorphosis and incomplete metamorphosis.
The development of silkworms goes through four stages: egg, larva (silkworm), pupa, and adult (moth). This development process is called complete metamorphosis.
Representative insects with complete metamorphosis
1. Compare the differences between locust adults and larvae.
2. What stages does the growth and development of locusts go through?
3. What is the difference between the development process of silkworm and that of locust?
Like locusts, the process of metamorphosis and development goes through three stages: fertilized egg, nymph and adult, which is called incomplete metamorphosis.
Operation:
1. Insect larvae develop into adults after multiple molts. The shed skin is ()
A. The superficial skin of insect larvae B. Insect larvae cortex
C. Exoskeleton of insect larvae D. Insect adult exoskeleton
2. The cocoon represents the silkworm ( )
A. Egg stage B. Larva stage C. Pupa stage D. Adult stage
3. Comparing the ontogeny of locusts and silkworms, there are no stages in the life history of locusts ( )
A. Fertilized eggs B. Larvae C. Pupas D. Adults
4. In summer, annoying mosquitoes can cause harm to people's health. What stages does a mosquito go through in its development process? ( )
A. Fertilized egg→larva→adult B. Fertilized egg → larva → pupa → adult
C. Fertilized egg → pupa → adult D. Fertilized egg → pupa → larva → adult
5. Regarding the reproductive development of silkworms and locusts, a classmate made the following summary. The wrong one is ( )
A. They all produce offspring through sexual reproduction
B. The development of fertilized eggs into larvae is completed outside the mother's body
C. Its development goes through fertilized egg → larva → pupa → adult
D. Its adults have well-developed wings suitable for flying.
Class summary
Do you know how many types of metamorphosis there are in insects? Which insect is introduced in the textbook as a representative?
Metamorphosis
Not completely perverted
Development goes through three stages: fertilized egg, nymph, and adult.
Completely perverted
Development goes through four stages: fertilized egg, larvae, pupa, and adult
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For more information about the PPT courseware "Reproduction and Development of Biological Reproduction and Development of Insects", please click the Reproduction and Development of Biological Ppt ppt Reproduction and Development of Insects ppt tag.
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Update Time: 2024-07-31
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