在植物学根茎叶的形态解剖教学中,植物营养器官的变态类型是比较容易混淆的。为此我们把有关根茎叶变态的部分集中在一堂课教学,取得了较好的效果。现将教学过程简介如下。这一堂课是在实验室上的。实验台上放有玉米根、甘薯、洋葱、菟丝子、马铃薯、黄瓜茎豌豆茎、藕、白茅等。在复习正常根茎叶的有关知识后,教师出示一盆仙人掌,让学生观察后回答:哪部分是茎?哪部分是叶?学生回答后,教师让学生带 In the morphological and anatomical teaching of botany roots and leaves, the type of metamorphosis of plant vegetative organs is more confusing. For this reason, we focused on the teachings of rhythm and leaf metamorphosis in one lesson and achieved good results. The teaching process is briefly described below. This class is in the lab. On the experimental bench, there were corn root, sweet potato, onion, dodder seed, potato, cucumber stem pea stalk, alfalfa, and imperata. After reviewing the knowledge of normal rhizomes and leaves, the teacher produced a pot of cactus and asked the students to observe and answer: Which part is the stem and what part is the leaf? After the student responds, the teacher asks the students to take