Examples of introductory words in biology

Introduction is an important part of biology teaching. It is a means to make students clear the purpose and content of learning, stimulate their interest in learning and make them eager to learn psychology. It is a guide to guide students towards their learning goals. Teacher Wang Gongde of Weifang summed up the following eleven methods:

1. Set suspense and introduce new lessons. When it comes to the water metabolism of green plants, it is like this: "As the saying goes,' Man struggles upwards and water flows downwards'. But the water in the green plants can flow downwards. For example, in summer and autumn mornings, we often find many small water droplets on the leaves of plants, which come from their roots. Then why can the water in plants flow downwards? Only by asking questions, setting suspense and attracting students' attention can we achieve good teaching results.

2. Stimulate emotions and introduce new lessons. When talking about the synthesis of protein, firstly, it is introduced that scientists in China have artificially synthesized crystalline bovine insulin for the first time in the world; When it comes to heredity, firstly, the "children's fish" cultivated in Tong Dizhou, triticale cultivated in Bao and hybrid rice cultivated in Yuan are introduced, which makes students full of national pride and patriotic feelings, thus arousing their strong interest in learning biology.

3. Introducing new lessons with intuitive teaching AIDS When teaching new lessons, if we can flexibly adopt intuitive teaching methods, we can not only deepen students' impression of knowledge, but also better attract students' attention and stimulate their curiosity. For example, when talking about protozoa, first show the test tube with paramecium culture solution in front of the students, and then ask, "Look, students, what's in this test tube?" Students will say "water" or "nothing". Then they will mysteriously tell students "there are animals in it", which will make students feel surprised and curious, and then produce a desire to know what the animals in it are like.

4. Introducing interesting and vivid stories into the new class with stories can not only increase students' knowledge of biological history, but also help to enliven the classroom atmosphere and improve students' interest in learning. For example, when talking about sex-linked inheritance, we can first tell the story of hemophilia, a royal disease initiated by Queen Victoria of England, or Dalton, the first scientist who discovered color blindness, who was also the first color-blind patient to be discovered.

5. Introducing a new lesson through painting When talking about biological adaptation, you can first show the dead butterfly or stick insect wall chart, and then ask the students to answer what it is. Some students will say "this is dead leaves" or "this is bamboo". At this time, the teacher will tell the students the correct answer, and the students will be amazed, thus attracting students' attention and making them enter the best learning state.

6. Introduce new lessons by voice. When talking about insects, students can listen to recorded songs of insects such as crickets and slugs first. When talking about amphibians, students can listen to recorded songs of frogs and toads first. When talking about birds, students can listen to the recorded songs of larks and thrushes first. When talking about mammals, students can listen to the recordings of tigers, dogs and cats first, so that students can cultivate their interest in loving animals and learning biological knowledge from the sounds of animals.

7. Introduce new courses with the hot spots that people pay attention to at present. When talking about nature protection, we should first introduce the problems that people are concerned about at present, such as acid rain, ozone layer destruction, and sharp decline of forests, and point out that whether these problems can be solved is closely related to biology, especially human beings, so as to arouse students' sense of urgency and improve their interest in learning biology well.

8. Introducing unexpected events into the new class, especially the events before class, has a great influence on the classroom teaching effect. After the solar eclipse occurred on September 23, 0987, my last class began like this: "The students all saw the solar eclipse just now, but do you know what the solar eclipse will do to people and creatures?" In this way, students' attention is naturally attracted to the classroom, and then a few words about the impact of solar eclipse on people and creatures are briefly introduced, and gradually transition to the content to be taught in the classroom.

9. Introducing new lessons with perceptual knowledge When talking about the adjustment of life activities, first talk about some knowledge that students are familiar with, such as: in autumn, trees will fall leaves, plants will sprout side branches after heading, and cocks will sometimes crow. , which leads to the topic and introduces new lessons.

10. Introduce new courses with local content. When talking about the evidence of biological evolution, I first introduced the Shanwang fossil in Linqu County, our province, which is the treasure house of the world. When talking about Cruciferae in plant classification, I first introduced Gong Bei, Weifang City, where our school is located. It is the origin of radish in Weixian County, a special product of our city, which evokes students' homesickness and improves the quality of classroom teaching.

1 1. Introduce new lessons with idioms and proverbs, for example, export molluscs or birds with "fighting for mussels, the fisherman gains", export the ecological functions of forests with "beautiful scenery, birds singing and flowers singing", and export the food chain with "big fish eat small fish, small fish eating shrimp, shrimp eating my mud"; "The mantis catches the cicada, and the yellowbird comes last" leads to the interspecific competition, "As you sow, you reap" leads to the inheritance of organisms, and "One mother gives birth to nine children, and nine children are different" leads to the variation of organisms. No matter in ordinary middle schools or vocational middle schools, biology classes are often ignored by students. There are many reasons for this, but according to the script, class. It attracts students' attention and stimulates students' interest in learning from the beginning of classroom teaching, thus making biology a favorite course for students and creating favorable conditions for better completing teaching tasks.