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教学手段的现代化是现代化教育的重要组成部分,是教学改革的一项重要内容。近两年来我们利用现代化的教学手段——实验录像指导部分生物学实验课,收到了较好的教学效果。与传统的实验教学相比,实验录像教学有以下几个特点: 一、明显增加实验的有效时间 用传统的教学方法做《观察植物细胞的有丝分裂》实验,解离需要10～15分钟,漂洗需10分钟,染色需3～5分钟,这样教师演示一次共需25～30分钟时间,教师做完后,学生再动手操作,一课时难以完成,即使完成,效果也不够理想。应用录像手段后,教师演示时间缩短到8分钟,然后在教师的指导下,学生动手操作,使整个实验过程紧凑、完整、一气呵成,明显增加了实验的有效时间。再如《叶绿体中色素的提取和分离》实验,用传统的方法,教师演示需要15～20分钟,学生自己动手还需要20～25分钟,这样,虽然实验做完了,但是没有小结的时间。应用录像后,挤出时
The modernization of teaching methods is an important part of modern education and an important part of teaching reform. In the past two years we have used modern teaching methods - experimental videos to guide some of the experimental biology courses and received good teaching results. Compared with the traditional experimental teaching, experimental video teaching has the following characteristics: First, significantly increase the effective time of the experiment to use the traditional teaching method to do “observe the mitosis of plant cells” experiment, dissociation takes 10 to 15 minutes, rinse required 10 minutes, dyeing takes 3 to 5 minutes, so that the teacher demonstrates a total time of 25 to 30 minutes. After the teacher finishes, the students can operate again. It is difficult to complete one lesson. Even if completed, the effect is not ideal. After applying the video recording method, the teacher’s presentation time was shortened to 8 minutes. Then, under the guidance of the teacher, the students began to operate, so that the entire experimental process was compact, complete and one-stop, significantly increasing the effective time of the experiment. Another example is the “Extracting and Separating Pigments from Chloroplasts” experiment. With the traditional method, teachers need 15 to 20 minutes to demonstrate, and students need 20 to 25 minutes to do it themselves. This way, although the experiment is done, there is no summary time. After applying the video, when extruding