生物课堂教学如何使学生积极主动地进行学习，使知识和能力同步得到增长？“观、读、议”的预习方法效果显著。现结合初中生物《根对水分的吸收》一节的教学，谈谈其做法和体会。观即观察。初中学生的思维正处在以具体形象思维为主的阶段。因此，在课堂教学中应注重直观教学， How to enable students to learn actively in biology classroom teaching so that the knowledge and ability can be synchronized? The concept of “view, read, discuss,” the pre-learning method is effective. Now combined with junior high school biology “root absorption of water” section of the teaching, talk about their practices and experiences. View that observation. Junior high school students' thinking is in the stage of thinking in concrete image. Therefore, in the classroom teaching should focus on visual teaching,