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初中《植物学》的根、叶、茎变态内容,分散在《根》、《叶》、《茎》各章中,教学完毕后,学生常常提出不少疑问,比如:“马铃薯为什么是块茎而不是块根?”“茎卷须和叶卷须是怎样判别的?”“枝刺和叶刺的区别是什么?”……为消除学生的疑难,比较是医治“模糊症”的良药。在讲完根、叶、茎这三章以后,根据同功变异和同源变异的概念,依照变态根与地下茎;地上茎的变态与叶的变态的主要判别方法,列制下表,进行复习,可以收到良好的效果。
The metamorphosis of the roots, leaves and stems of the “Botany” in junior middle school is scattered among the chapters of “Root”, “Leaf” and “Stem”. After the teaching is completed, students often ask questions such as: “Why is potato a tuber? Not the root?” “How are the stem tendrils and leaf curls distinguished?” “What is the difference between thorns and leaf thorns?” ... In order to eliminate students’ problems, comparisons are the cure for “fuzziness.” After the three chapters on roots, leaves, and stems were discussed, based on the concepts of isomorphism and homology variation, according to the main discriminating methods of abnormal roots and underground stems, metamorphosis of stems and abnormality of leaves, the following table was used for review. Can receive good results.