Seed germination experiment 1 teaching objectives of lecture notes;
1. Stimulate students' interest in experimental observation through seed germination experiment;
2. By designing the process of seed germination experiment, learn to observe and record the conditions that affect seed speech by means of comparative experiment;
3. Understand the steps and contents of designing experiments and making experimental plans, and be able to design your own experimental plans as required.
Teaching focus:
Experiments of seed germination can be designed.
Teaching difficulties:
Will put forward two problems that need to be solved in the seed germination experiment.
Teaching preparation:
Design a table for the experiment.
Teaching process:
I. Introduction:
1, guide students to read the text on P 1
2. Introduction to the conversation.
Teacher: "Last term, the students studied very hard. Do you remember planting impatiens? Scientific research is usually carried out through experiments. First of all, we must make a careful experimental plan. Now let's study what conditions affect the germination of mung bean seeds, shall we? "
Second, explore the content:
1. Discuss the conditions for mung bean seed germination.
1) Let the students talk about how mung bean seeds germinate.
2) Summarize what the students say about the conditions of mung bean seed germination. (blackboard writing: water, plant in the soil, the temperature is right. )
3) What might be the result of changing one of the conditions? Tell me what conditions can be changed. (blackboard writing: can you water less? Can we not plant it in the soil? Let it be illuminated, will you? Can it germinate at a lower temperature or in a freezer? )
2. Discuss how to prove it by experiment.
Let the students discuss from the following five aspects:
1) What problems do you want to study and how do you plan to do it?
What do you think the result will be?
3) What conditions have you changed?
4) What conditions have not changed?
5) How do we know whether changing conditions has an effect on seed germination?
3. Determine the research questions and write the experimental scheme.
1) the group discussed what problems to choose for research.
2) Adjust and balance the topics selected by students, so that students can study each project.
3) Guide the students to read the examples and tables in the textbook, find out the content requirements, and then start writing the experimental scheme.
Third, the class summarizes.
Fourth, after-school expansion.
Find information about seed germination.
Teaching objectives of the second lecture on seed germination experiment
1, review and summarize the learning methods of primary school science, and understand the existing knowledge and experience of students;
2. Have a preliminary understanding of the learning tasks and contents of this semester, and discuss the main learning methods and learning systems of this semester.
3. Stimulate students' interest in learning science through interesting experiments.
Teaching preparation
Experimental equipment for burning candles underwater: candles, water and an empty basin.
teaching process
1, speak freely and meet classmates:
Teacher: We have been studying science for two years. What activities have impressed you in the past two years? Tell me.
Teacher: I didn't expect everyone to be so interested in science. Then, in the summer vacation of more than two months, we have experienced many things, which ones are related to science?
Teacher: Just now, everyone talked a lot about science. We can write these things down. This is a good scientific paper. At that time, the teacher will organize everyone to participate in the national science essay competition for primary school students.
2, understand the teaching materials, clear tasks:
Teacher: Starting today, we will explore the mysteries of science together again. So, what is the content of fifth grade science? Let's take a look first.
Organize students to look at the lid: a child is observing the environmental protection bottle. What is particularly prominent is that children are recording, emphasizing the importance of seeking truth and recording in scientific inquiry activities. The next four small pictures represent the four units of this book, namely, biology and environment/light/earth's surface and its changes/movements and forces.
Let students read the catalogue and its contents freely, and then express their ideas freely.
3, formulate system, course selection representative:
To explain, the usual study is in groups of four, and the team leader rotates once a month.
Elect science leaders and representatives of science classes of each major group, and clarify relevant responsibilities and rights.
Explain the monthly selection method of science stars (adding stars from homework, equipment preparation, class, cooperation and so on). )
4, do small experiments to stimulate interest:
Teacher: Everyone studied hard just now, which made the teacher very happy. To this end, I want to do a little experiment with you. The name of the experiment is: let the candle burn on the water.
Show the experimental equipment (candles, water, an empty basin) and ask the students if they can do it and let them have a try.
Teacher's demonstration: First, stand the candle firmly at the bottom of an empty basin, light it and gently pour cold water into the basin until it is flush with the edge of the candle. After a while, the flame of the candle fell under the water.
Basic principle: combustion, water cooling, so that the surrounding candles can not reach the melting point to melt, through the wax core to support combustion.
Summary: In our science textbooks, there are many such activities and experiments, which need our careful observation and thinking to discover the mystery.
Teaching objectives of the third lecture on seed germination experiment
Scientific concept: Mung bean seeds need moisture and suitable temperature to germinate.
Process and method: Learn to sort out the collected data and draw scientific conclusions according to the data.
Emotion, attitude and values: realize the importance of comparing experiments, strictly controlling experiments and repeating experiments.
Teaching focus
Through experiments, it is known that mung bean seeds need water and suitable temperature to germinate.
Teaching difficulties
Learn to sort out the collected data and draw scientific conclusions based on the data.
Teaching preparation
Experimental schedule, experimental record and statistical table of experimental information (5 reference books)
teaching process
First, the findings in the communication experiment:
Have all the mung bean seeds we planted sprouted? What about mung bean seeds in other groups?
Second, organize and analyze the experimental information:
1. Teachers distribute statistical tables of experimental information, and the group leader is responsible for collecting experimental information of the same experimental group.
2. Analysis of experimental information:
(1) What's the difference between the experimental group and the control group?
(2) Can we draw a conclusion from the experimental data?
(3) Is the experimental conclusion consistent with our pre-experiment guess?
Third, exchange experimental information:
1, listen carefully to other different experimental groups to introduce their experimental methods and information.
2. Communicate with other groups to find out their findings in the experiment and listen to how they interpret the experimental results with data.
3. Collect the whole class experiments and analyze the conditions needed for mung bean seed germination. Identify the content that everyone has objections to.
4. Summary: The necessary conditions for mung bean seed germination are temperature, moisture and air.
Fourth, planting mung bean sprouts:
1, Guide: What should I do with sprouted mung bean sprouts?
2. Determine the task: plant mung bean sprouts in a flowerpot and put them in a suitable place to let them grow for a period of time.
3. Predict which conditions will affect the growth of mung bean sprouts.
4. It is suggested to write an observation diary or record the growth of mung bean sprouts.
References:
The basic conditions for seed germination are:
One is the temperature. The lowest temperature of seed germination is 6-7℃, and it can germinate normally at 12- 14℃. The optimum temperature is 20-25℃, and the highest is 35℃.
The second is moisture. Generally, it is necessary to absorb water equivalent to 120- 140% of the air-dried weight of seeds before germination.
The third is adequate oxygen.