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教学目的要求:1.通过比较常见作物的种子在外形上的不同,指导学生认识这些种子,并能说出这些种子的名称。2.通过观察种子的内部构造,指导学生认识种子在构造上都具有胚根和胚芽两个重要部分,培养学生观察物体细小构造的能力和把握物体共同性的能力。3.通过教师演示,让学生懂得把种子“种”在玻璃杯里的方法并能在课后各自观察、了解种子发芽的过程,体会一粒种子就是一株植物的雏型。教学重点:观察种子的内部构造,找出其共同点。课前准备:1.前次课要求每个学生带一个无色透明的玻
Teaching objectives and requirements: 1. By comparing the common shape of the seeds of different crops, to guide students to recognize these seeds, and can say the name of these seeds. 2. By observing the internal structure of the seed, the students are guided to recognize that the seed has two important parts of the radicle and germ in their structure. Students should be trained to observe the fine structure of the object and to grasp the commonality of the object. 3. Through the teacher's demonstration, let the students know how to “seed” the seeds in the glass and observe them after class, understand the process of seed germination and realize that a seed is a prototype of a plant. Teaching focus: observe the internal structure of the seeds to identify their common ground. Pre-class preparation: 1. The previous lesson requires each student to take a colorless and transparent glass