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"Structure and Function of Ecosystems" PPT download
Part One: Situation Import
"The mantis stalks the cicada, but the oriole follows behind" refers to what biological phenomenon?
learning target
1. Understand the components of ecosystems and the interrelationships among them.
2. Understand the concepts of food chains and food webs and the determination of trophic levels.
3. Master the simple food web diagram.
PPT on the structure and function of ecosystems, part 2: analysis of the relationship between some organisms in the grassland ecosystem
Observe the pictures, analyze and discuss: What organisms are present in the grassland ecosystem? What is the relationship between various living things?
Think and discuss
1. What role do plants on grasslands play in the ecosystem?
Synthesize organic matter through photosynthesis for use by various organisms
2. What is the relationship between the various animals on the grassland and the vegetation on the grassland?
Predation relationship (or relationship between eating and being eaten)
3. What are the relationships between the various animals on the grassland?
Predation relationship, competition relationship
Things to note when writing about the food chain
1. Start writing from the producer. (The starting point is green plants, and the end point is the highest-level animal)
2. The arrow points from the producer to the consumer, and from the low-level consumer to the high-level consumer.
3. Decomposers and abiotic environments cannot appear in the food chain.
PPT on the structure and function of the ecosystem, part 3: feedback in class
1. The food chain of "the mantis stalks the cicada, followed by the oriole" can be accurately expressed as ( )
A. Cicada → mantis → oriole
B. Oriole→Mantis→Cicada
C. Plant → Cicada → Mantis → Oriole
D. Oriole→Mantis→Cicada→Plant
2. Agricultural and forestry pests and rodent infestations in a certain area are very serious. The most likely reason is ( )
A. The amount of pesticides used is small. B. The pesticides are not applied in time.
C. People hunt and kill birds indiscriminately D. Pests and rats breed quickly
Keywords: Free download of Biology PPT courseware for the second volume of the eighth grade edition of Beijing Normal University, PPT download of the structure and function of ecosystems, .PPT format;
For more information about the "Structure and Function of Ecosystems Ecosystems and Their Stability" PPT courseware, please click the "Structure and Function of Ecosystems ppt Ecosystems and Their Stability ppt" tag.
"Structure and Function of Ecosystems" PPT teaching courseware:
The first part of the PPT teaching courseware "Structure and Function of Ecosystems" content: Pre-class exercises: 1. The factors that affect the ____, ____, __, etc. of organisms are called ecological factors; they can be divided into __________ and __________ categories, and biological factors refer to Their living environment...
"Structure and Function of Ecosystems" PPT courseware download:
"Structure and Function of Ecosystems" PPT courseware download Part One: New Lesson Introduction Living things must continuously ingest food to obtain energy. Where do these substances and energy originally come from? How is it transmitted in the ecosystem? Learning objectives 1. Explain the ecosystem...
"Structure and Function of Ecosystems" PPT courseware:
"Structure and Function of Ecosystems" PPT courseware Part One: Situation Introduction Why do organisms need to constantly obtain food? Where did these matter and energy originally come from? How are matter and energy transferred in the ecosystem? What are its characteristics? Why...