People's Education Edition Biology for Grade 8, Volume 1
People's Education Edition Biology for Grade 8, Volume 2
People's Education Press High School Biology Compulsory Course 2
Beijing Normal University Edition Seventh Grade Biology Volume 2
People's Education Edition seventh grade biology volume 1
Beijing Normal University Edition Eighth Grade Biology Volume 1
Beijing Normal University Edition Seventh Grade Biology Volume 1
People's Education Press seventh grade biology book volume 2
Beijing Normal University Edition Eighth Grade Biology Volume 2
High School Biology Compulsory Course 1, published by People's Education Press
Jiangsu Education Edition 8th Grade Biology Volume 1
Jiangsu Education Edition Seventh Grade Biology Volume 1
Jiangsu Education Edition Seventh Grade Biology Volume 2
Jiangsu Education Edition 8th Grade Biology Volume 2
!["Stability of Ecosystems" PPT courseware](http://daogebangong.oss-cn-beijing.aliyuncs.com/ppt/preview/1/f81a3306-cd9d-4f4c-a711-fd15ceb394f7.webp)
Category | Format | Size |
---|---|---|
Beijing Normal University Edition Eighth Grade Biology Volume 2 | pptx | 6 MB |
Description
"Stability of Ecosystems" PPT courseware
Part One: Self-Study Examination
1. What is ecosystem stability?
After a long-term development process, the ecosystem has gradually formed a relatively stable and balanced state between biological and non-biological substances and energy, and between organisms and organisms. This is the stability of the ecosystem.
2. What are the causes of ecosystem stability?
When the ecosystem undergoes certain changes or is disturbed by external factors, it can overcome the changes within the system and the influence of external disturbing factors through self-regulation within the ecosystem, and maintain a relatively stable and balanced state.
That is: the ecosystem has a certain self-regulating ability.
3. What are the factors that undermine the stability of ecosystems? Please give examples?
(1) Natural factors: volcanic eruptions, earthquakes, mudslides, floods, typhoons and tsunamis, etc.
(2) Human factors: over-development, environmental pollution, etc.
Ecosystem stability PPT, part 2: teacher-student interaction
Analysis of the causes of Kaiba forest destruction
What was the state of Kaiba Forest before 1906?
Why have the number of deer in the forest continued to decline after 1925?
How has the entire Kaiba Forest ecosystem changed in more than 30 years? What factors caused this change?
Alien species invasion
Someone returned from traveling abroad and brought back some special fruits from the trip. The fruits were detained while he was undergoing customs inspection and he was informed of my country's regulations regarding bringing fruits into the country from abroad. Based on the knowledge about invasion of alien species in this chapter, analyze the reason why the fruit brought into the country by this tourist was detained by the customs.
Ecosystem Stability PPT, Part 3: Class Feedback
1. In the past, the Loess Plateau had vast forests and boundless grasslands, but now it has become barren mountains. The main reason is ( )
A. Caused by the earth’s greenhouse effect B. Caused by the drying of the climate
C. Indiscriminate deforestation by humans has caused damage to the stability of the ecosystem D. Caused by changes in the earth's crust
2. In a relatively closed ecosystem composed of grass, hares, and wolves, if the wolves are killed, the change in the number of hares can be represented by which curve in the figure below ( )
3. Figures A and B in Figure 23-02 are both diagrams of the food web of the grassland ecosystem. Answer based on the pictures.
(1) The largest number of animals in picture A is ______; the smallest number of animals in picture B is ______.
(2) In Figure B, the producer is _______; the consumer who feeds directly on plants is __________.
(3) The food web in Figure B has _____ food chains. Write the longest one-day food chain ____________; there are ____ kinds of consumers, and they are _______________.
(4) In Figure B, if some criminals hunt a large number of foxes in order to obtain fur, it will cause a large increase in _______, leading to ________, and eventually _________.
(5) Which ecosystem in this question is easy to maintain? Why?
Ecosystem Stability PPT, Part 4: Class Review
In this lesson, you learned the following knowledge:
1. What is ecosystem stability?
2. Why is the ecosystem stable?
3. What is the relationship between ecosystem stability and self-regulation ability?
4. What factors lead to the destruction of ecosystem stability?
Keywords: Free download of Biology PPT courseware for the second volume of the eighth grade edition of Beijing Normal University, PPT download of the stability of the ecosystem, .PPT format;
For more information about the PPT courseware "The Stability of Ecosystems Ecosystems and Their Stability", please click the Stability of Ecosystems ppt Ecosystems and Their Stability ppt tag.
"Stability of Ecosystems" PPT courseware download:
"Stability of Ecosystems" PPT courseware download Part One Content: Classroom Thoughts Thinking: In an ecosystem, organisms such as wheat, rats, and bacteria live. Assuming better climate conditions and a large increase in wheat, how will the number of rats change? Ecosystem development..
"Ecosystem Stability" PPT download:
"The Stability of Ecosystems" PPT Download Part One Content: New Lesson Introduction Gardening staff planted a piece of grass in a corner of the park. In order to prevent birds from eating grass seeds, they covered the grass with a net. After a while, they found that The grass in the net was eaten up by insects..
"Ecosystem Stability" PPT:
"The Stability of Ecosystems" PPT Part One Content: Learning Objectives 1. Tell what the stability of ecosystems is. 2. Outline the reasons why ecosystems have certain stability. 3. Briefly describe the reasons why ecosystem stability is destroyed. ... ... ... ecosystem..
File Info
Update Time: 2024-08-31
This template belongs to biology courseware Beijing Normal University Edition Eighth Grade Biology Volume 2 industry PPT template
"Stability of Ecosystems" PPT courseware Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
Tips: If you open the template and feel that it is not suitable for all your needs, you can search for related content "Stability of Ecosystems" PPT courseware is enough.
How to use the Windows system template
Directly decompress the file and use it with office or wps
How to use the Mac system template
Directly decompress the file and use it Office or wps can be used
Related reading
For more detailed PPT-related tutorials and font tutorials, you can view: Click to see
How to create a high-quality technological sense PPT? 4 ways to share the bottom of the box
Notice
Do not download in WeChat, Zhihu, QQ, built-in browsers, please use mobile browsers to download! If you are a mobile phone user, please download it on your computer!
1. The manuscript PPT is only for study and reference, please delete it 24 hours after downloading.
2. If the resource involves your legitimate rights and interests, delete it immediately.
3. Contact information: service@daogebangong.com
"Stability of Ecosystems" PPT courseware, due to usage restrictions, it is only for personal study and reference use. For commercial use, please go to the relevant official website for authorization.
(Personal non-commercial use refers to the use of this font to complete the display of personal works, including but not limited to the design of personal papers, resumes, etc.)
Preview
!["Stability of Ecosystems" PPT courseware](http://daogebangong.oss-cn-beijing.aliyuncs.com/ppt/preview/1/bbeb5577-04cd-4079-94f4-01f110e09fe5.webp)