"Protecting Biological Diversity" PPT Courseware 3

Description

"Protecting Biological Diversity" PPT Courseware 3

"The extinction of species is a natural process, but it is currently believed that man-made activities have accelerated the rate of species extinction. Once a species becomes extinct, it cannot be regenerated. The loss of biodiversity will create a fundamental crisis in agriculture, medicine, health care, and industry. , causing damage to the ecological environment and threatening humankind's own survival. - Excerpted from "China's Environmental Protection Agenda 21"

A piece of information: Since the emergence of life on the earth 3.5 billion years ago, 500 million species of living things have existed, and most of them have disappeared now. Species extinction is a natural phenomenon in the evolutionary history of life on earth. It is a normal event. For example, the trilobites 250 million years ago and the dinosaurs 65 million years ago were all wiped out. But since humans entered industrial society and participated in natural things with arrogance, the entire extinction timetable has been greatly advanced. The rate of species extinction in geological time is extremely slow. On average, one species of birds becomes extinct every 300 years, and on average one species of mammals becomes extinct every 8,000 years. By 1600 to 1700, one animal became extinct every 10 years; from 1850 to 1950, the average extinction rate of birds and beasts was one species per year, that is, more than 100 species of animals became extinct, and this extinction continued to accelerate. With. The recorded animal extinction data since 1600 is staggering: 120 species of mammals and 250 species of birds no longer exist. According to a report by the United Nations Environment Program: Currently, one plant species becomes extinct in the world every minute and one animal species becomes extinct every day. This situation, which is thousands of times higher than the natural "background extinction" rate, is concerning for the earth. A severe warning about the living conditions and quality of life!

Rare animal species in my country

Elk (commonly known as the four-digit artiodactyl order) inhabit swamp areas and feed on grass and aquatic plants. They were raised in Nanyuan, Beijing before 1894. Since then, only a few are left abroad. The wild species have become extinct. They were transported by the United Kingdom after 1985. Return some to free range.)

Giant pandas (living in arrow bamboo forests, afraid of cold and heat, lonely in nature, males and females living separately, able to swim, good at climbing trees and living in tree holes and rock crevices, like to eat bamboo, fruits and animal bones, docile nature, weak self-defense ability, Often harmed by natural enemies, it is distributed in western and northern Sichuan, my country.)

Alligator (also known as tuó) is a rare animal endemic to my country. It lives at the bottom of ponds and swamps and feeds on fish, frogs and birds. It breeds in July and lays eggs, which are hatched by sunlight and weeds. The female crocodile protects the nest. Strong sex.)

Giant salamander (Salamander, Class Amphibians, the largest amphibian in the world, endemic to my country, inhabits mountain streams, emerges during the day and emerges at night, preys on fish, shrimps and insects, fertilizes in vitro, widely distributed in my country, mostly in central and southern China; vocal baby)

Reasons why biodiversity is threatened:

1. Indiscriminate deforestation

2. Indiscriminate hunting and killing

3. Environmental pollution

4. Alien species invasion

Protecting biological diversity is an important part of sustainable development and is our unshirkable responsibility!

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 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 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...

File Info

Update Time: 2024-11-17

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

Preview