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Authoritative PPT Summary
"Ecosystem Stability" PPT
Part One: Learning Objectives
1. Tell us what ecosystem stability is.
2. Outline the reasons why ecosystems have certain stability.
3. Briefly describe the reasons why ecosystem stability is destroyed.
Ecosystem Stability PPT, Part 2: Topic Exploration
Explore theme one
ecosystem stability
Creatures in the ecosystem are born and die, and move in and out; inorganic environmental factors such as sunlight, temperature, and moisture are also constantly changing.
Ecosystems are constantly evolving and changing. But for a relatively mature ecosystem, as long as the various changes in the system do not exceed certain limits, the structure and function of the ecosystem will not change significantly.
Due to the immigration, emigration and other changes of organisms in the ecosystem, the ecosystem is always developing and changing, so we will:
When an ecosystem develops to a certain stage, its structure and function can remain relatively stable (that is, a state of relatively stable balance between biological and non-biological matter and energy, and between living things), which is called the stability of the ecosystem.
Explore theme two
Causes of Ecosystem Stability
Thinking: What changes will occur when a group of sheep moves into the grassland?
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.
Ecosystems have certain self-regulating capabilities.
Ecosystem Stability PPT, Part 3: Standard Training
1. Minamata disease is a disease caused by mercury poisoning. In the food chain of "aquatic plants → shrimp → fish → osprey", the highest mercury content in the body is ( )
A. Aquatic plants B. Shrimp C. Fish D. Osprey
2. If four organisms in a stable ecosystem form a food chain, their relative quantity relationship within a certain period of time is as shown in the figure. If the number of B increases, it will cause ( ) within a period of time
A. The number of C and D increases, and the number of A decreases
B． The number of A and D increases, and the number of C decreases
C. The number of A and C increases, and the number of D decreases
D. The quantities of A, C, and D all increase
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;
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"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..
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"Stability of Ecosystems" PPT courseware:
"Stability of Ecosystems" PPT courseware Part 1: Self-study examination 1. What is the stability of ecosystems? After a long-term development process, the ecosystem has gradually formed a relatively stable balance between biological and non-biological substances and energy, and between living things.