在中学生物课教学的过程中,直观教具的运用是很重要的。因为生物的种类繁多,研究起来很是复杂,要使学生能透彻地了解教材,必须通过配合实物、标本、模型和挂图来讲解或演示,才能使学生得到显明的系统的深刻的知识。但是在课堂上运用这些直观教具时,存在着一定的困难。因为动植物的实物有的太大或太小,有些稀少罕见的在当地又找不到,不可能使学生都能看到;标本虽然能代替实物,但在教学时,又不能使学生都看清楚,若是逐一地让每个人轮流观察,又要分散学生的注意力,同时课堂秩序也不易维持,往往减低教学效果。模型虽比标本鲜明清楚,但一时要使每人都能看清,也是不可能的。挂图虽然 In the process of biology teaching in middle school, the application of visual aids is very important. Because of the variety of living things, it is complicated to study. To enable students to understand the teaching material thoroughly, it is necessary to explain or demonstrate them in cooperation with objects, specimens, models and flipcharts so as to enable students to gain a profound and systematic knowledge of the system. However, there are some difficulties in using these visual aids in the classroom. Because animals and plants some of the physical too large or too small, some rare and rare in the local can not find that students can see; specimens can replace the real thing, but in teaching, they can not make students look Clearly, if one by one for everyone to take turns observing, but also to distract the attention of students, while the classroom order is not easy to maintain, often reducing the teaching effectiveness. Although the model is clearer than the specimen, it is impossible for one moment to make it visible to everyone. Flip chart though