Bean germination identification standard, 2022 bean sprout qualification standard

Teaching Objectives] Scientific Concept: Certain conditions are required for seeds to germinate.

Process and Methods: Experience the process of designing seed germination experiments, and observe and record the conditions affecting seed germination by means of comparative experiments.

Emotions, Attitudes, Values: Develop an interest in experimental observations.

Teaching Focus: Learn how to use the method of controlling a certain condition in a comparative experiment to study the conditions that affect the germination of seeds.

Teaching difficulties] can design their own experimental plans according to the requirements.

Teaching preparation] a number of mung bean seeds, experimental plan (refer to P3), experiment record sheet (refer to P4).

Teaching process] 1. Discuss the conditions for seed germination:

1. Conversation introduction: The life of a plant begins with the germination of seeds. So, what do you think is needed for a seed to germinate?

2. Students discuss freely, report the results, and write a summary board for the teacher. Soil. Water. Temperature.

Air. Sunlight.

3. Further guidance (pick up a mung bean seed): This is an intact mung bean seed, if you want it to germinate, do you need all these conditions just now? What are the necessary conditions for mung bean seeds to germinate?

What might be the result if we changed one of these conditions? (Here it is important to change only one condition).

4. Teacher: What conditions can we change? Is it okay to water a little less? Is it okay not to plant it in the soil? Is it okay to let it be illuminated? Can it germinate at a lower temperature or in the refrigerator? (Raw).

5. Collect students' ideas, what basis can prove that your views are correct? (**: Students can use experimental proof).

2. Design seed germination experiments:

3. Students are free to choose the research content and make statistics in a timely manner. (Preset: water group, light group, temperature group, soil group, etc., you can appropriately exclude content that is not suitable for classroom research.) ）

4. Take one of the groups as an example and brainstorm how to design an experimental plan.

1) What problem do you want to study and what do you plan to do?

2) What will be the results for you?

3) What conditions did you change in your research?

4) What conditions have not changed?

5) How do I know if the changed conditions have an effect on seed germination?

6) What else should I pay attention to during the experimental research?

5. Students complete the design of their own experimental schemes, and the teachers will guide them to encourage students who choose the same conditions to communicate with each other.

1. Further read the examples in the textbook, and the teacher guides you to pay attention to the points of attention, such as the size of mung beans should be about the same, why to put 2-3 mung beans in each box, why to pad paper towels, etc.

2. The teacher provides** and discusses how to record together.

1. Encourage students to go home and complete the experiment carefully and make observation records.

2. In the next class, we will analyze the results of our experiments, please prepare the experiment plan and experiment record form, and we will add star evaluation to the students who have completed the experiment seriously.

3. Students who have the ability and conditions can also take pictures of the various changes in the germination of mung bean seeds and try to write an experimental report.

Board book design: Seed germination needs conditions: soil. Water. Temperature.

Air. Sunlight.

I know, but I won't tell you.

According to the latest national bean sprouts standards in 2022, the eligibility criteria for soybean sprouts are as follows:

1.The bean sprouts are straight, the bud body is short and thick, can not be rootless, the bud color is white with yellow, no yellowing, blackening, blue, broken buds, rotten heads, rotten tails, and many bean shells.

2.Free of food contaminants such as lead, cadmium, total arsenic, total mercury, chromium, etc., and the food stool additives sulphur dioxide.

3.In the production process of bean sprouts, it is forbidden to use substances such as 6-benzyladenine.

There is no yellowing or blackening. According to the "National Food Safety Standard for Bean Sprouts", soybean sprouts.

The bean sprouts should be straight, the bud body should be short and thick, not rootless, the bud color should be white with absolute yellow, no yellowing, blackening, blue, broken buds, rotten and excited heads, rotten lead tails, and many bean shells, as of July 23, 2022, it is still in strict accordance with the safety acceptance standards of the national food department.

Legal analysis: China's testing standard for the unbridled transportation of bean sprouts is the "Bean Sprouts Wei Crack Liang Shengjian Noise Standard (GB 22556-2008)".

Legal basis: Full text of "Hygienic Standard for Bean Sprouts (GB 22556-2008)".