The first volume of Chinese eighth grade "Biological Invaders" teaching plan

This paper is a rational exposition of the knowledge that biological migration does harm to human beings through unnatural ways. Starting with the explanation of the concept of "biological invader", this paper introduces the harm that "biological invader" brings to human beings, its destructive effect on the ecological environment, the reasons for its formation, the different views of the scientific community on "biological invader" and the measures taken by various countries in the world at present. Through learning, students should master the method of reading expository texts. At the same time, it also urges us to be highly vigilant against this special ecological phenomenon and raise our awareness of environmental protection.

Teaching objectives:

(1) Knowledge objective:

Accumulate vocabulary, master the pronunciation and meaning of words such as "plunder, habitat, fencing, blame", understand the meaning of words such as "doomed, colorful, helpless, natural selection, indifference", and learn to use them.

Understand the ecological environment knowledge introduced in this paper and understand the situation of biological invaders.

Ability goal:

Clear the order of this article, grasp the content of the article as a whole, and improve the reading ability of popular science articles.

Improve students' ability to collect screening information.

3. Master the interpretation methods used in the article

(B) moral education objectives:

Strengthen the sense of prevention and social responsibility, and strive to build and protect homes. Teaching focus:

1. Understand the ecological environment knowledge introduced in this article and the situation of biological invaders.

2. Learning this article, through sorting out the interpretation order and mastering the interpretation methods used in the article, can collect screening information and enhance the sense of urgency and responsibility for biological invasion. Difficulties in teaching: Understand the knowledge of ecological environment and the situation of biological invaders introduced in this paper.

(3) Teaching method: 1. Text learning is mainly based on cooperative inquiry, and teachers only give necessary guidance. 2. Discuss and summarize. Through various forms of data collection, discuss and summarize topics, * * * and solutions.

Teaching means; mixed-media

Teaching process:

First, preview

Read the text carefully (at least three times).

2. Students preview the author.

3. Understand new words by consulting materials.

4. Be able to master the paragraph level of the text through self-study.

5. Prepare to collect relevant information about biological invasion before class, and write down the name, source, invasion and harm of biological invaders.

Second: import

Play a news story about biological invaders with multimedia, and ask students to summarize the news content in one sentence.

A: Alien biological invaders have brought serious harm to the ecology of China.

Teacher introduction: Yes! Biological invaders not only endanger our country, but also other countries and even the whole world. Let's learn Mei Tao's "Biological Invaders" blackboard writing topic.

Third, learn the text by solving problems.

Teacher: What is invasion?

A: "Invasion" refers to the entry of foreign or harmful substances.

Teacher: What is a biological invader?

A: Immigrants who originally lived in a foreign country and moved to a new ecological environment through unnatural means are called biological invasion.

Teacher: Where did you find it?

Health: the first paragraph

Teacher's guidance, please tick the text and see what the first paragraph tells us.

Health: also tell us the harm of biological invaders.

Teacher: What are the hazards of biological invaders? (blackboard writing)

Health: It not only destroys the original ecosystem in a certain area, but also may cause immeasurable economic losses to human society.

Teacher: Please find out the biological invaders who caused these two kinds of harm in the text.

Health: spotted beetle, red ant, palm tree, snake lizard, bobcat (shown by the teacher in multimedia)

Teacher: The students' comprehensive answers show that they have strong generalization ability. Which of these intruders are detailed?

Health: palm snake.

Teacher: Great. Now the teacher will embarrass you and see who is the best. Please tell us the story of bamboo in the form of a story.

In this session, several students are selected to compete, and two of the best storytelling stars are selected for awards.

Teacher: The story is over. The teacher wants you to be an announcer again. Please report the case of palm snake on the news broadcast.

This section requires students to recall and consolidate news-related knowledge. You can take three students to the competition and choose the best announcer to reward them.

Teacher: In the performance of the students, we learned the serious harm caused by biological invaders. What about biological invaders collected by students and their harm?

Health: Toads, water hyacinths, termites, etc.

Teacher: The students have a wide range of knowledge, and the teacher will also show the information I collected. Please look at the electronic whiteboard. (Multimedia display of biological invaders)

Health: A lot! It's amazing.

Teacher: Yes! They can do so much harm that we have to take preventive measures, but first, we must know how they spread. Students, do you know?

Health: unnatural ways (increasingly prosperous international trade, crossing the pet trade, etc. ) blackboard writing (mode reason)

Teacher: the answer is very rewarding, so the teacher warned the students to keep pets and not to cause pets! Since it is harmful, how to control it? What did the text say?

Health: The article says that there are two attitudes: intervention and non-intervention.

Division; Do you agree with that statement?

Let the students debate in this session for two minutes.

Division; The students' debate is really fierce. In your war of words, we learned that the harm caused by biological invaders is very serious, so many experts realized the harm and took measures. Please find out what measures the experts have taken and read them out.

Health: In the last paragraph.

Teacher: Students, what measures do you have?

Health: pets purchased under strict international trade control cannot be released at will. .......

Teacher: It seems that all students can become little guardians of environmental protection, and the teacher also has several measures that we hope to encourage. (Multimedia presentation)

1. Be careful when introducing.

2. Raise awareness of biological invasion and ecological security.

3. Pets kept by family members must not be "released" at will.

4. Strictly control entry-exit inspection and quarantine.

Teacher: What explanation methods are used in this article?

Student: For example, analogical definition number (blackboard writing).

Teacher: Through study, we recognize the biological invaders. What order does this article use to explain biological invaders?

Health: logical order (blackboard writing)

Course summary

After studying this article, we have a clear understanding of biological invaders and their harm, and even many biological invaders have seriously threatened the ecological balance. This problem has sounded the alarm for our environmental protection, so it is urgent to protect nature and pay attention to ecological balance. I hope everyone will be vigilant and take strict precautions (blackboard writing)

Extension extension

Please draft an environmental slogan about biological invasion.

This link allows students to play freely, and the teacher supplements them appropriately.

Ending of intransitive verbs

The vivid news facts are not out of nothing, and a series of amazing figures are shocking. The devastating disaster caused by biological invasion is eroding our homeland, so let us shoulder the historical responsibility and pay attention to environmental protection. Scientifically resist biological invasion and actively protect the ecological environment!