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在动物教学中,老师在讲解青蛙外部形态时,一般向学生展示的标本多数是浸制标本。如果把青蛙制成剥制标本,再设置一些生态环境,那么就会使标本显得栩栩如生。用这样姿态自然,形象逼真的标本作教具,不仅能激发学生的学习兴趣;同时,也克服了浸制标本由于药液长期浸泡,青蛙皮肤变色,浸制液气味重,容易溢出,老师上课携带不方便等缺点。下面介绍标本的制作方法。 1.剥皮 选择个体大,形态完整的活蛙,将其投入盛有75％酒精棉球的标本瓶中,麻
In animal teaching, when the teacher is explaining the external form of the frog, most of the specimens displayed to the students are impregnated specimens. If the frogs are made into stripped specimens and then some ecological environment is set, the specimens will appear vivid. Using such a natural and realistic image as a teaching aid can not only stimulate students’ interest in learning, but also overcome the impregnation of the specimen due to long-term soaking of liquid medicine, frog skin discoloration, heavy smell of infusion liquid, and easy spillage. Disadvantages such as inconvenience. Here’s how to make specimens. 1. Skinning Choose a live frog with a large body and a complete shape and put it into a specimen bottle containing 75% alcohol cotton balls.