《种子的构造》一课中关于单子叶植物种子玉米的构造,教科书上是这样设计实验的:用放大镜观察玉米种子的构造,观察前把玉米种子按课本上的图示纵切。观察后,比较玉米种子与前面观察过的花生、菜豆、蚕豆、绿豆的构造有什么相同和不同的地方。通过比较使学生认识玉米种子与上面四种种子构造的相同点都是有种皮和 The structure of monoculture seed corn is described in the textbook “Structure of Seed”. The structure of corn seed is observed with a magnifying glass. Before the observation, the corn seeds are cut longitudinally according to the text on the textbook. After the observation, the corn seeds were compared with the peanuts, beans, broad beans and mung beans that had been observed in the same or different places. Through the comparison so that students understand the concept of corn seeds and seeds of the above four structures are the same kind of skin and