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我国初中生年龄多在12—15岁之间。他们好动、好学、好奇、求知欲强。而实验所具有的形象、具体、新奇的特点,可有效发挥知识对学生的吸引力,激发学生学习的内驱力,发展学生的抽象思维。 1 展示概念的形成过程生物是一门实验科学,许多生物的基本概念便是在实验基础上形成的。在教学中多做实验,可以使学生比较形象。牢固地掌握概念。 “光合作用”这个概念是科学家二百余年辛勤工作的结晶。教材将众多科学家的实验浓缩为三个。我在教学中,先指导学生做好“绿叶在光下制造淀粉”的实验(采用银边天竺葵,可对比得出光合作用需要叶绿体)及两个演示实验。然后在实验结果的分析中得出
Junior high school students in China more than the age of 12-15 years old. They are agile, studious, curious, curious. The experiment has the image, the specific and novel characteristics, can effectively play the attractiveness of knowledge to students, inspire students to learn the internal drive, the development of students' abstract thinking. 1 shows the concept of the formation process of biology is an experimental science, many of the basic concepts of biology is formed on the basis of the experiment. Do more experiments in teaching, students can make more images. Firmly grasp the concept. The concept of photosynthesis is the result of more than two hundred years of hard work by scientists. The textbook has condensed the experiments of many scientists into three. In my teaching, I instruct the students to do a good job of “making green leaves under the light of starch” experiment (using silver geranium, photosynthesis can be obtained by comparing chloroplasts) and two demonstration experiments. Then come to the analysis of the experimental results