"Biosphere is the common home of living things" PPT courseware

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"Biosphere is the common home of living things" PPT courseware

Part One: Multiple Choice Questions

1. Among the following human activities, the ones that can protect the ecological environment are ( )

A. Deforestation to plant grass B. Planting trees

C. Introducing alien species D. Killing wild animals

[Analysis] Choose B. This question examines the significance of afforestation. Forests have the functions of preventing wind and sand, reducing soil erosion, regulating climate, increasing rainfall, maintaining carbon-oxygen balance in the biosphere, absorbing toxic gases, and purifying the air. Therefore, afforestation is conducive to protecting the ecological environment. Deforestation to plant grass, introduction of alien species and hunting of wild animals will damage the ecological environment.

2. The Yellow River used to be a river with clear water and good water quality, but now it is a turbid current. The reason for this phenomenon may be ()

A. Continuous heavy rains and river flooding

B. People discharge large amounts of domestic sewage into the river

C. Soil and water loss caused by human destruction of vegetation

D. changes in geological structure

[Analysis] Choose C. This question examines the role of plants and the reasons for the abundance of sediment in the Yellow River. The forest can prevent wind and fix sand, and the grassland can firmly hold the soil and prevent soil erosion. In the past, the vegetation on the Loess Plateau was dense, the water and soil erosion was light, and the water of the Yellow River was clear. Later, due to human activities, the vegetation on the Loess Plateau was extensively destroyed, leaving the surface exposed, causing serious water and soil erosion. Every year, a large amount of sediment flows into the Yellow River with rain. This has resulted in today's turbulent current situation.

3. (Selected Refinement·Nantong Academic Examination) In order to successfully host the Selected Refinement Shanghai World Expo, relevant departments in Shanghai conduct inspections of vehicle exhaust gases. The main purpose of this move is to alleviate ( )

A.Air pollution B.Water pollution

C.Soil pollution D.Solid waste pollution

[Analysis] Choose A. This question examines the hazards of automobile exhaust. Car exhaust contains carbon monoxide, nitrogen oxides and other solid particles that have adverse effects on the human body, especially leaded gasoline, which is more harmful to the human body. Car exhaust is a type of air pollution. The purpose of detecting car exhaust is to control exhaust emissions, meet emission standards, and reduce air pollution.

The biosphere is the common home of living things PPT, part 2: reading questions

9. Read the information below and answer the following questions:

In recent years, "algae blooms" have occurred frequently in Taihu Lake. Algae bloom is a water pollution phenomenon caused by the excessive growth of certain blue-green algae in freshwater bodies such as lakes and ponds. When cyanobacteria occur in large numbers, a thick layer of green algae forms on the water surface and releases toxins - lakes, which can kill fish, shrimp and other aquatic animals. After cyanobacteria and aquatic animals die, decay, and decompose, they consume a large amount of dissolved oxygen in the water, causing the water body to produce a foul odor. A large amount of industrial and domestic sewage and farmland water containing chemical fertilizers flow into rivers and lakes, resulting in excessive nitrogen, phosphorus and other plant nutrients in the water body, which is the main cause of "algae blooms".

(1) What is the cause of the "algae bloom" phenomenon?

________________________________________.

(2) "Water bloom" is a water pollution phenomenon. What harm does it have?

____________________________________________.

(3) Regarding the causes of "algae bloom", what measures do you think should be taken to restore Taihu Lake to its original clear and beautiful appearance? _______________________.

[Analysis] This question examines the causes and hazards of water pollution. As a large amount of industrial wastewater, domestic sewage and farmland water containing chemical fertilizers flow into rivers and lakes, resulting in excessive nitrogen, phosphorus and other plant nutrients in the water body, causing a large number of cyanobacteria to multiply in the water body, forming a thick layer of green algae on the water surface. , resulting in "water bloom". Cyanobacteria can release toxins from lakes, which can kill fish, shrimp and other aquatic animals. After cyanobacteria and aquatic animals die, decay, and decompose, they consume a large amount of dissolved oxygen in the water, causing

Water bodies produce foul odors and pollute water quality. Only by purifying industrial sewage and domestic sewage, reducing the use of chemical fertilizers in farmland, banning the use of phosphorus-containing detergents and other measures to reduce water pollution can we fundamentally eliminate the pollution of Taihu Lake and restore Taihu Lake to its original clear and beautiful appearance.

Answer: (1) A large amount of industrial wastewater, domestic sewage and farmland water containing chemical fertilizers flow into rivers and lakes, resulting in excessive nitrogen, phosphorus and other plant nutrients in the water body, causing a large number of cyanobacteria in the water body to multiply, resulting in "algae blooms"

(2) Cyanobacteria produce toxins in lakes, which can kill fish, shrimp and other aquatic animals. After cyanobacteria and aquatic animals die, decay, and decompose, they consume a large amount of dissolved oxygen in the water, causing the water body to produce a foul odor and polluting the water quality.

(3) Purify industrial sewage and domestic sewage, reduce the use of chemical fertilizers in farmland, and prohibit the use of phosphorus-containing detergents, etc.

Keywords: Jiangsu Education Edition eighth grade biology PPT courseware free download, biosphere is the common home of living things PPT download, .PPT format;

For more information about the PPT courseware "The Biosphere is the Largest Ecosystem. The Biosphere is the Common Home of All Living Things", please click the "The Biosphere is the Largest Ecosystem ppt. The Biosphere is the Common Home of All Living Things" ppt tag.

"Biosphere is the common home of living things" PPT:

"The Biosphere is the Common Home of Living Things" PPT Part One Content: Situation Introduction Information: In the vast universe, the earth is the only planet known to humans that is suitable for habitation and life. We should not only love our beautiful home, but also protect this home. Earth..

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Update Time: 2024-10-02

This template belongs to biology courseware Jiangsu Education Edition 8th Grade Biology Volume 1 industry PPT template

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