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"The Biosphere is the Largest Ecosystem" Understanding the Biosphere PPT Courseware 2
1. Scope of the biosphere
1. Scope of the biosphere
bottom of atmosphere
Most of the hydrosphere
surface of lithosphere
2. Based on sea level, the upper and lower reaches are 10 kilometers each, and the total thickness is about 20 kilometers.
3. Most of the surface of the lithosphere is covered with soil, which is the "foothold" of all terrestrial organisms.
Exercise 1: Which of the following statements about the biosphere is correct:
A. The biosphere is composed of plants, animals and microorganisms
B. The biosphere includes the entire earth
C. The biosphere refers to the range that biological activities can reach
D. The biosphere refers to the sum of living things on the earth and their living space
2. Diverse Ecosystems
1.Grassland ecosystem
Grassland plays an important role in soil and water conservation, wind protection and sand fixation.
2. Wetland ecosystem
Wetlands have the functions of purifying water quality, storing floods and fighting droughts. It is known as the "Kidney of the Earth".
3. Marine ecosystem
The oxygen produced by plants in the ocean accounts for 70% of the total oxygen produced by the earth each year.
4. Forest ecosystem
Features: There are many kinds of animals and plants, and it is known as "green reservoir" and "lungs of the earth".
5. Freshwater Ecosystems
3. The biosphere is a unified whole
1. Every ecosystem is related to other surrounding ecosystems, and this correlation is manifested in all aspects.
2. The biosphere is a unified whole, the largest ecosystem on earth, and the common home of all living things.
Exercise 3: Which of the following ecosystems are known as "green reservoirs":
A. Marine ecosystem B. Farmland ecosystem
C. Forest ecosystem D. Freshwater ecosystem
Exercise 4: Although the area where the pesticide "DDT" is applied only accounts for a small part of the land area, DDT has also been found in animals as far away as Antarctica. This phenomenon shows:
A.DDT is extremely volatile B.These Antarctic animals may have migrated from the pesticide application area
C. The expedition team brought DDT to Antarctica. D. Many of the impacts of human activities on the environment are global.
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"The Biosphere is the Largest Ecosystem" Understanding the Biosphere PPT Courseware 9:
"The Biosphere is the Largest Ecosystem" Understanding the Biosphere PPT Courseware 9 1. Scope of the Biosphere Is there life everywhere on the earth? It is impossible for living things to exist inside the earth's crust. The place on earth suitable for biological survival is actually only a thin layer on its surface...
"The Biosphere is the Largest Ecosystem" Understanding the Biosphere PPT Courseware 8:
"The Biosphere is the Largest Ecosystem" Understanding the Biosphere PPT Courseware 8 Ask students to self-study the content on page P2830 of the textbook to understand the types of ecosystems. Forest ecosystem distribution: humid areas. Characteristics: Plant and animal species ________, complex and stable structure. ..
"The Biosphere is the Largest Ecosystem" Understanding the Biosphere PPT Courseware 7:
"The Biosphere is the Largest Ecosystem" Understanding the Biosphere PPT Courseware 7 1. Scope of the Biosphere Concept of the Biosphere: The sum of all living things on the earth and their environment is called the biosphere. 1. Thickness of the biosphere: about 20 kilometers 2. Scope of the biosphere: the bottom of the atmosphere..