Acer negundo is delicious and has a faint bouquet, so it is called an immortal fruit. However, Acer truncatum is difficult to cultivate. Modern Acer truncatum trees are all grafted and propagated, and the rootstocks are mostly peach trees or wild plums. Since the end of the Qing Dynasty, due to the war and other reasons, the varieties have deteriorated, the planting area has dropped sharply, and the output has been low, especially in recent years, which is far from meeting the market demand and the price has remained high. Therefore, it is imperative to expand the planting area. Because it is difficult and long to cultivate by ordinary methods, please design a feasible scheme to propagate Acer truncatum seedlings by tissue culture technology.
② Conditions for completing this operation:
The group finished their homework.
There are feedback from teachers and classmates.
There are time constraints and opportunities for revision.
Some of the students in this homework survey were carried out with their classmates, but the writing part was done by themselves. This assignment is carried out after completing the module "Application of Biotechnology in Other Aspects".
Example 2: After learning the respiratory function of plants, students can be assigned such homework: Dad likes to grow flowers, and when winter comes, he is worried that flowers will freeze to death, so he moves them into the bedroom for cultivation. Please try to explain whether this is good or not according to what you have learned and tell dad.
Example 3: After learning the chapter "Human Nutrition", students can list the foods they and their families have eaten in recent days according to the structural proportion of five foods in the "Balanced Diet Pagoda" of China residents, analyze whether their and their families' diets are reasonable, and put forward opinions and suggestions for their families' reasonable diets. In the process of completing this assignment, students will connect what they have learned in class with real life. This kind of homework can not only help students further consolidate their knowledge, but also help them learn to care about the people around them.
Example 4: Before learning the knowledge of "safe medication", the teacher can arrange for students to collect several drug instructions after class, pay attention to what signs and contents are on the instructions, what should be paid attention to before medication, and so on. Let the students walk into the classroom with these questions and the collected instructions on medication, and devote themselves to their studies.