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初中《生物》教材里,介绍根的基础知识,是以根的吸收功能为中心,使学生获得关于根的形态、构造和功能的基础知识,了解这些知识在农业生产中的应用.下面就这部分教材的重点和难点,谈一些体会. 一、根系和它的分布这一课主要阐明根系的概念、根系的分布及其与外界环境的关系.课前,要准备直根系和须根系的挂图,菜豆或棉花,玉米或小麦的根
In the “Biology” textbook of junior high school, the basic knowledge of the root is introduced based on the absorption function of the root, which enables the students to gain basic knowledge of the morphology, structure and function of the root and to understand the application of these knowledge in agricultural production. Part of the textbook focus and difficulties, talk about some experience.First, the root system and its distribution This class mainly clarify the concept of root system, root system distribution and its relationship with the external environment.Pre-class, to prepare the root system and the root system of the flip chart , Beans or cotton, corn or wheat roots