"The Difficult Mission of Protecting Biodiversity" PPT courseware

"The Difficult Mission of Protecting Biodiversity" PPT courseware

Part One: Situation Import

The history of the development of human society is the history of continuous development of human beings using wild animal and plant resources. However, with the expansion of population and rapid economic development, the types and quantities of wild animals and plants are decreasing at an alarming rate. Biodiversity is facing serious threats, so where does the threat come from?

learning target

1. Pay attention to the current status of biodiversity conservation through group collaborative exploration.

2. Actively participate in activities to protect biological diversity based on life experience.

3. Establish the concept of protecting biological diversity.

PPT on the arduous mission of protecting biological diversity, part two: exploration theme

Threats to biodiversity

1. Acceleration of species extinction

Extinct wild animals in my country include rhinos, wild horses, saiga antelopes and Xinjiang tigers. There are still many animals that have become extinct and have not been discovered or identified.

2. Reduction in genetic diversity: The number of wild types of many species has been severely reduced and is on the verge of extinction. Some are only kept in captivity or cultivated types, with severe inbreeding.

Causes of biodiversity loss

1. Destruction of ecosystem diversity: Many river bays, lakes and wetlands have been transformed into farmland. Forest reserves have plummeted, grasslands have been degraded, and desertification has become serious...

2. Habitat loss and fragmentation: The tropical rainforest, home to 50% of the world’s species, has been reduced by half its original area.

3. Predatory over-exploitation: The number of antelopes, wild deer, precious fur animals, and various fish species in our country has been greatly reduced.

The Tibetan antelope is a unique species in my country, and its cashmere is more valuable than gold. It is a national first-class protected animal. In recent years, the Tibetan antelope has been on the verge of extinction, but poachers' gunfire still sounds from time to time.

4. Environmental pollution: Pollutants are transferred along the food chain of the ecosystem, causing great damage and poisoning to organisms and humans, causing the reduction or disappearance of sensitive species and directly disrupting the ecological balance.

5. Diversification of agricultural and forestry varieties: As the number of crop types decreases, the corresponding predators, pollinators and seed-dispersing organisms disappear.

6. Introduction of alien species:

⑴ Water hyacinth: An alien species. After being introduced into Dianchi Lake in Kunming, Yunnan Province, my country, water hyacinth grew wildly due to water pollution, causing many aquatic organisms to become almost extinct.

⑵ American White Moth: An alien species, it is a leaf-eating pest that seriously harms forest trees. It has a wide adaptability, strong reproductive ability, many transmission routes, high harm, and difficult removal and control.

Ways to protect biodiversity

1. In situ protection (fundamental approach)

⑴The most effective way to protect in situ is to establish nature reserves. my country has established more than 3,000 nature reserves, 16 of which have been added to the "World Biosphere Reserve Network".

⑵The purpose of establishing a nature reserve: (main function)

Protect concentrated distribution areas of rare and endangered animals and plants, and protect representative natural ecosystems.

2. Ex-situ conservation: species whose survival and reproduction are seriously threatened are moved out of their original places and moved to zoos, botanical gardens, aquariums and endangered animal breeding centers for special protection and management.

3. Strengthen education and legal management: Improve citizens’ awareness of environmental protection by studying laws such as the Forest Law of the People’s Republic of China and the Wildlife Protection Law of the People’s Republic of China.

The arduous mission of protecting biological diversity PPT, the third part: training to meet standards

1. The nature reserve established to protect the red-crowned crane is located in ( )

A.Wolong, Sichuan B.Yangxian, Shaanxi

C. Yancheng, Jiangsu D. Qinghai Lake Bird Island

2. (2011·Heze Academic Examination) The scene of "the fragrance of rice flowers tells of a good year and the sound of frogs singing" has become less and less common. Among the following items, the one that is not the main reason for the massive decline of frogs is ()

A.Habitat and breeding environment are destroyed B.Environmental pollution is becoming increasingly serious

C. The struggle for survival among frogs intensifies D. Mass hunting by humans

3. (2011·Fuzhou Academic Examination) The helpless behavior of the birds migrating as a family in the picture tells people that the fundamental measure to protect animal diversity is ( )

A. Prevent the invasion of alien species

B. Protect animal habitats

C. Control the number of harmful animals

D. Promote the importance of protecting animals

4. Which of the following are not rare plants unique to my country ( )

A. Ginseng B. Metasequoia

C. Ginkgo D. Davidia involucrata

Keywords: Jiangsu Education Edition eighth grade biology PPT courseware free download, the arduous mission of protecting biological diversity PPT download, .PPT format;

For more information about the PPT courseware "Biodiversity and the Difficult Mission to Protect Biodiversity", please click the Biodiversity and its Protection ppt The Difficult Mission to Protect Biodiversity ppt tag.

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