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教学目的了解植物需要的元素及吸收矿质元素的基本过程。重点掌握根吸收矿质元素需进行离子交换以及由于离子在土壤中存在的状态不同,而交换的具体方式有所不同。教具根进行离子交换的三种方式图解及其剪贴图。教学方法讲述法和讲解法教学时数一课时教学过程(一)复习提问植物细胞为什么能从外界吸收水分?(目的是让学生一方面巩固植物对水分吸收原理的知识;另一方面为明确根吸收离子与吸收水分有别打好基础。)
Teaching Objectives To understand the elements needed by plants and the basic process of absorbing mineral elements. Focus on the root absorption of mineral elements need to be ion exchange and ion due to the existence of different states in the soil, and the specific way of exchange is different. Teaching aids for ion exchange three ways to illustrate and its clip art. Teaching methods to explain the law and explain the method of teaching hours a lesson teaching process (a) review questions why plant cells can absorb moisture from outside? (The purpose is to enable students to consolidate the plant on the one hand, the principle of moisture absorption knowledge; the other hand, Absorption of ions and absorb water do not lay a good foundation.)