"Protecting Biological Diversity" PPT Courseware 5

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"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 a rare aquatic mammal unique to China. It has lived and thrived in the Yangtze River for more than 20 million years. However, in recent decades, its number has declined rapidly. In 2006, scientists specifically surveyed the number of white-tip dolphins along the Yangtze River, and found not even one. Why has a species that has withstood the test of time gone extinct in just a few decades?

Read text pages 110-114 independently and think about the following questions

1. What animals and plants are on the verge of extinction in my country?

2. What threats does biodiversity face? What are the reasons?

3. What are the main measures to protect biological diversity?

Preview test:

1. Threats to biodiversity: Many species of animals and plants are on the verge of ____, and some have even been ____.

2. The "living fossil" ____ in the animal kingdom, Davidia involucrata is called ____, and it is the "____" in the plant kingdom.

3. The main measures to protect biological diversity are:

(1) Establish ____ and implement on-site protection; (2) ____ protection;

(3) Establish a ____ for endangered species; (4) Promulgate relevant ____ and ____, and issue relevant ____. Among them, in situ conservation: mainly refers to ________, which is the most ____ (fill in the most fundamental or most effective) measure to protect biological diversity.

4． Functions of a Nature Reserve: It is ____, ____ and ____.

5. The Qinghai Lake Bird Island Nature Reserve was established to protect ________; the Changbai Mountain Nature Reserve was established to protect ________; the Yangxian Nature Reserve in Shaanxi was established to protect ________; and the Zhalong Nature Reserve in Heilongjiang was established to protect_ ___; The Qinghai-Tibet Plateau Uninhabited Land Nature Reserve is to protect ____; Sichuan Wolong Nature Reserve is to protect ____.

1. Threats to biodiversity

1. What threats does biodiversity face: The number of some species has declined sharply, some species are on the verge of extinction, and some ecosystems have been severely damaged.

2. Reasons why biodiversity is facing threats

1) Human-induced deforestation - indiscriminate deforestation

2) Man-made attacks on animals - indiscriminate hunting and killing

3) Herdsmen attack the grassland - overgrazing

4) Arbitrary discharge of three wastes from industrial and agricultural production and living - environmental pollution

5) Blind introduction of foreign organisms - biological invasion

【Cooperative Research】

1. What is the main reason for the large-scale reduction of forests? What impact will large-scale forest reduction have on biodiversity?

The main reasons for the large-scale reduction of forests are human deforestation and natural fires.

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. (Indiscriminate deforestation)

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

The Tibetan antelope is known as the "Plateau Elf" because the horns of the Tibetan antelope are very long and beautiful, and it is very beautiful as a home furnishing; more importantly, the cashmere of the Tibetan antelope is the best quality cashmere in the world, and is made of Tibetan antelope cashmere. The shawls and scarves are sold under the trade name "Shatoosh", which means "King of Velvet". Because it can easily pass through a ring, it is also called a "ring shawl". A shawl 2 meters long and 1 meter wide woven with this kind of velvet weighs only 100 grams. Its price is as high as 5,000-30,000 US dollars, reaching 50-300 US dollars/gram, while the average price of gold is only 40 US dollars/gram. It has become a symbol of nobility and wealth for ladies in some countries. Kashmir, an area controlled by India, is the earliest and largest region in the world for processing "Shatoosh". Most of the raw materials come from Tibet, my country. The processed "Shatoosh" is mainly sold to Europe and the United States, and some directly transport raw materials to some European and American countries. processing. Driven by economic interests, illegal armed poachers carry out crazy hunting of Tibetan antelopes, causing the Tibetan antelopes to be on the verge of extinction. (Indiscriminate hunting and killing)

2. Measures to protect biological diversity:

1. Establish nature reserves - in situ protection

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.

The establishment of nature reserves is the most effective measure to protect biological diversity.

2. Ex-situ conservation: In order to protect biological diversity, ex-situ conservation refers to relocating species whose survival and reproduction are seriously threatened due to reasons such as the survival conditions no longer exist, the number of species being extremely small, or the difficulty of finding mates, etc. Moved into zoos, botanical gardens, aquariums and endangered animal breeding centers for special protection and management. Ex situ conservation is a complement to in situ conservation and provides the last chance for survival for organisms that are about to become extinct.

3. Establish a germplasm bank of endangered species

4. Promulgate relevant laws and regulations and issue relevant documents for protection: In order to protect biological diversity, China has successively promulgated laws and regulations 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". document.

4. Summary: Biodiversity protection methods and measures

1. In-situ conservation (establishing nature reserves)

2. Ex-situ conservation

3. Establish a germplasm bank of endangered species

4. Promulgate relevant laws and regulations, and formulate relevant policies for protection

5. Classroom Testing

1. In order to protect the complete temperate forest ecosystem, our country has established ( )

AChangbai Mountain Nature Reserve BQinghai Lake Nature Reserve

C Fengyang Mountain Nature Reserve D Wolong Nature Reserve

2. Which of the following is not a threat to biological diversity ( )

A Reduction in forest area B Environmental pollution C Biological evolution D Biological invasion

3. Among the following concepts about protecting animal diversity, which one is appropriate ( )

After species A become extinct, they can still regenerate

BThe extinction of biological diversity does not pose a threat to humans themselves

CIntroducing different organisms from around the world to increase our country’s biodiversity

D Creatures that have no direct interest or relationship with humans should also be preserved

4. The greatest impact of the extinction of biological species on human beings is ( )

A suffered a serious economic blow B lacked scientific research data

C The ecological balance is affected D The potential value of biological resources is permanently eliminated

5. Many of China’s biological resources are not the best in the world. In order to enrich China’s biological resources, we should vigorously introduce biological resources. ( )

6. Some animals are on the verge of extinction. The best way is to move these animals out of their original places and into zoos for special protection and management. ( )

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

"Protecting Biological Diversity" PPT courseware 7:

"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 destruction of biological diversity will cause problems in agriculture, medicine and health care.

"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 4:

"Protecting Biological Diversity" PPT courseware 4 Review old lessons What aspects does biological diversity include? Diversity of biological species Gene diversity Diversity of ecosystems Northern white rhino (Sumatran rhinocerous) There are less than 25 northern white rhinos left in the world..

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Update Time: 2024-11-22

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

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