"Analysis of the Impact of Human Activities on the Ecological Environment" Impact of Human Activities on the Biosphere PPT Courseware 4

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"Analysis of the Impact of Human Activities on the Ecological Environment" Impact of Human Activities on the Biosphere PPT Courseware 4

Think about it and discuss it:

Some people compare the earth to a "spaceship" in which humans are the passengers. Do you think this metaphor is appropriate? When taking a ship, when you feel that the air in the cabin is dirty, you can go to the deck to breathe fresh air; the garbage on the ship can be sent to a special place for disposal after the ship docks; the number of passengers on the ship will not increase to the point of overcrowding... Is this also true on the "spaceship" Earth? What else can you think of from this?

Very reasonable and appropriate. However, the "spaceship" of the Earth is different in that it has more and more passengers, cannot dock to unload garbage, and cannot be updated due to air pollution. Explain the effects of population growth and human activities on the environment.

How much wealth can forests provide to humans? Ask the students to do the math together:

1. One hectare of forest can effectively store 9,855 tons of water. At a price of 2 yuan per ton, its value is ( ) yuan.

2. The amount of soil loss prevented by 1 hectare of forest is 244.2 cubic meters. Calculated based on the cost of soil fixation of 1 cubic meter being 10 yuan, its value is ( ) yuan.

3. Forests can prevent landslides and protect banks on slopes, reservoirs, roads, ditches and rivers. One hectare of forest can prevent 7.5 cubic meters of landslides. If the project maintenance cost per cubic meter is 20 yuan, then its value is ( )Yuan.

Causes of sandstorms

Ingredients: strong winds, sand sources and unstable air

Human Factors:

L

overexploitation of natural resources

excessive deforestation

over-cultivation of land

Impact of biological invasion on the environment

1. Destroy the ecological environment and cause ecological pollution.

2. Loss of biological diversity.

3. Ecological disasters occur frequently and cause serious losses.

Environmental problems mainly include:

1. Forest decline

2. Air pollution

3. Water pollution

4. Hole in the ozone layer

5. Greenhouse effect

6. Biological invasion

Summary

Examples of damaging the ecological environment:

1. Deforestation---the forest area is reduced, and there are fewer and fewer places for animals and plants to live.

---Sandstorms are becoming more and more serious

2. Indiscriminate hunting and killing---there are fewer and fewer types of animals and plants, and many rare species are declining day by day.

3. Biological invasion---more organisms lose their original life activity areas

Actions to improve the ecological environment

1. Planting trees

2. Establish nature reserves

3. Increase publicity and punishment

Consolidation exercises

1. After the forest is severely cut down, which of the following problems may we face ( )

A Soil erosion B Climate change C Damage to biodiversity D All of the above are possible

2. Which of the following measures to protect forests is scientific ( )

A. Planned and reasonable felling of mature timber. B. Prohibition of felling.

C Plant a kind of tree in a large area, neat and beautiful

D Spray high-intensity pesticides to eliminate forest pests

3. Which of the following measures is conducive to the sustainable development of forests ( )

A Use natural enemies to eliminate pests B Absolutely prohibit logging

C Planting trees D Cutting down trees to solve the fuel problem

4. The main reasons causing the endangerment and extinction of wild animals and plants are ( )

A natural selection

B Human development and utilization of wild animal and plant resources

C species degradation

D Excessive hunting or harvesting of wild animals and plants by humans, pollution and changes to the habitat environment

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Update Time: 2024-09-07

This template belongs to biology courseware People's Education Press seventh grade biology book volume 2 industry PPT template

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