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Authoritative PPT Summary
"Ecosystem and Ecological Balance" PPT
Part One: Target Navigation
1. Perceive the full text as a whole and continue to train the ability to extract useful information.
2. Understand the main content of the article and understand the expression and meaning of key sentences.
3. Understand the importance of ecological balance and cultivate environmental awareness
Ecosystem and ecological balance PPT, part 2: Introduction to the author
Hou Xueyu (1912-1991), a famous ecologist in my country, was born in He County, Anhui Province. Graduated from the Department of Agricultural Chemistry of Nanjing Central University (now Nanjing University) in 1937. From 1945 to 1949, he studied at the Pennsylvania State University Graduate School in the United States and received his master's and doctorate degrees. He is the author of "Vegetation of China" and so on.
Ecosystem: refers to a unified whole composed of organisms and the environment in a certain space in nature. In this unified whole, organisms and the environment interact and restrict each other, and are in a relatively stable dynamic equilibrium state within a certain period of time.
Ecological balance: refers to the state of high adaptability, coordination and unity between organisms and the environment in the ecosystem, and between various groups of organisms within a certain period of time, through energy flow, material circulation and information transmission. That is to say, when the ecosystem is in equilibrium, a certain proportional relationship is maintained between the various components of the system, the input and output of energy and matter tend to be equal over a long period of time, and the structure and function are in a relatively stable state. When there is external interference, it can return to the initial stable state through self-regulation. Within the ecosystem, between producers, consumers, decomposers and the abiotic environment, a relatively stable state of energy and material input and output dynamics is maintained within a certain period of time.
Ecosystem and ecological balance PPT, part three: exploration
1. What are the indicators of ecological balance?
Answer: When the energy flow and material circulation process in the ecosystem maintain a balanced state for a long time rather than temporarily, the ecosystem will have the largest species and number of organisms, the largest biomass, and the largest productivity.
2. What kind of explanation method is mainly used in the full text? What is its function?
Answer: Give examples; Function: List forest ecosystems and grassland ecosystems, and vividly explain the characteristics of ecosystems and methods of maintaining ecological balance.
Explain the method and its function
Understand the main features of common explanation methods (examples, categories, definitions, analogies, numbers, drawing diagrams, quotations) and the role of each explanation method, and then analyze and judge based on the content of the passage. First find out the explanation method used, and then answer specifically based on the function of the following explanation method.
The role of common explanation methods:
1. Give examples: concretely and truly explain the ××× characteristics of things.
2. Classification: clearly explain the ××× characteristics of things. Explain the characteristics/reasons of things into categories to make the explanation more organized.
3. Use an analogy: vividly explain the ××× characteristics of the thing, which enhances the image and interest of the article.
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"Ecosystem and Ecological Balance" PPT courseware:
"Ecosystem and Ecological Balance" PPT courseware Part One: Learning Objectives 1. Understand the author's relevant knowledge, memorize the key words in the article, and perceive the overall content of the article. 2. Appreciate the accurate and scientific language of the article, and master the explanation methods and their functions in the article. ..