"Stability of Ecosystems" PPT courseware

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"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.

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"Ecosystem Stability" PPT:

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Update Time: 2024-08-31

This template belongs to biology courseware Beijing Normal University Edition Eighth Grade Biology Volume 2 industry PPT template

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