"Protecting Biological Diversity" PPT Courseware 7

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"Protecting Biological Diversity" PPT Courseware 7

"The extinction of species is a natural process, but current human activities have greatly accelerated the rate of species extinction. Once a species becomes extinct, it cannot be regenerated. The elimination of biodiversity will cause a fundamental crisis in agriculture, medicine, health care, and industry. , causing damage to the ecological environment and threatening humankind's own survival."

We can find that the extinction rate of birds and mammals is getting faster and faster over time. Biological diversity faces serious threats. This phenomenon is very common in the world. Although our country is one of the countries with the richest biological species, it is no exception. Our country's biological diversity is also under serious threat.

Think about it: What are the causes of threats to biodiversity?

discuss

1. What impact does the large-scale forest reduction have on biodiversity?

The large-scale reduction of forests has destroyed the forest ecosystem, caused air and ground humidity to decrease, and caused the reduction or decline of many plants, especially shady plants. At the same time, because animals have lost their habitat and food, the number of some animal species has decreased sharply, so that about to extinct.

2. What causes the Tibetan antelope to be endangered? Is there a similar phenomenon happening around you?

It was caused by the crazy hunting of Tibetan antelopes by illegal armed poachers.

3. Why does the discharge of domestic sewage into water bodies lead to the reduction of aquatic animal species?

Domestic sewage is discharged into water bodies, which greatly promotes the eutrophication of water bodies and causes algae and other plankton to multiply in large numbers. When the remains of these organisms are decomposed, they consume a large amount of oxygen in the water and produce toxic substances, resulting in the death of fish and other aquatic organisms, and a sharp reduction in species and numbers.

4. Why does the crazy growth of water hyacinth affect the survival of other aquatic organisms? Does something similar happen where you live?

The wild growth of water hyacinth causes other aquatic plants and aquatic animals to lose living space, sunlight and nutrients, causing the types and numbers of other aquatic plants and aquatic animals to decrease or become extinct.

Summary: What are the main causes of threats to biodiversity?

Change and destruction of living environment.

Predatory development and exploitation.

environmental pollution.

Invasion of alien species.

Reflection: What behaviors do we have that directly or indirectly destroy biological diversity? What should be done in the future? What effective measures should be taken to protect biological diversity?

What is a nature reserve?

In order to protect biological diversity, humans have divided a certain area of ​​land or water body containing protected objects for protection and management. This is a nature reserve. As of the end of 2000, a total of 1,276 nature reserves of various types had been established across the country, with a total area of ​​123 million hectares, accounting for 12.44% of the country's land area, ranking among the top in the world.

Do you know what nature reserves there are in our country? What organisms are mainly protected?

Dafeng Elk Nature Reserve

Changbai Mountain Nature Reserve

Qinghai Lake Bird Island Nature Reserve

Changdao County, Shandong Province

Do you know what nature reserves there are in our country? What organisms are mainly protected?

The Fengyang Mountain Baishanzu National Nature Reserve in Zhejiang Province currently houses the South China tiger, an endangered national first-level protected animal in my country.

In order to protect biological diversity, our country has successively promulgated laws and documents such as the Forest Law of the People's Republic of China, the Wildlife Protection Law of the People's Republic of China, and the China Nature Conservation Outline.

The wildlife protection department of a certain place received a report that a certain restaurant had been selling wild game meat recently, and many wild birds were served to the table. Law enforcement officers rushed to the scene but found no wild animals in the restaurant. They had an idea and went to the restaurant's trash can to search and found several bird feet:

Based on the shape of these feet, law enforcement officials concluded that there were wild birds in the food sold in the restaurant. How did law enforcement officials come to this conclusion? Can you guess the habitat environment of these birds based on their foot shapes?

Keywords: Teaching courseware for protecting biological diversity, download PPT courseware for eighth-grade biology from the first volume of the People's Education Edition, download courseware for eighth-grade biology slides, download PPT courseware for protecting biological diversity, .PPT format;

For more information about the "Protecting Biological Diversity" PPT courseware, please click the "Protecting Biological Diversity ppt" tab.

"Protecting Biological Diversity" PPT courseware 6:

"Protecting Biological Diversity" PPT Courseware 6 In the natural state, one kind of bird becomes extinct in an average of 2000 years, and one kind of mammal becomes extinct in an average of 8000 years. Now, under the influence of human activities, one kind of bird becomes extinct in an average of 2 years, and an average of one kind of mammal becomes extinct in 1.2 years. Animals become extinct...

"Protecting Biological Diversity" PPT Courseware 5:

"Protecting Biological Diversity" PPT Courseware 5 Review of the previous section: 1. What is the connotation of biological diversity? 2. What are the fundamental measures to protect biological diversity? 3. The diversity of biological species is essentially diversity. [Think about it and discuss it] The white-tip dolphin is...

"Protecting Biological Diversity" PPT Courseware 4:

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Update Time: 2024-11-02

This template belongs to biology courseware People's Education Edition Biology for Grade 8, Volume 1 industry PPT template

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