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本节教材分为两部分:一、青蛙;二、两栖纲的特征和起源。通过本节教材的教学应达到以下目的: 1,使学生获得关于青蛙的外部形态和内部结构的基础知识,掌握青蛙适于两栖生活的形态结构上的特点;了解青蛙与人类的关系。 2.使学生了解两栖纲的主要特征和两栖动物的起源。 3.通过解剖青蛙的实验,使学生进一步理解青蛙形态结构的知识,学会解剖青蛙的方法。 现对两栖纲的教学提出以下建议:
This section of the textbook is divided into two parts: First, the frog; Second, the characteristics and origin of amphibia. Through the teaching of this section of the teaching materials should achieve the following purposes: 1, so that students get the basic knowledge of the external morphology and internal structure of the frog, to grasp the frog suitable for amphibious life of the morphological structure of the characteristics; understand the relationship between frogs and humans. 2. Make students understand the main characteristics of amphibians and the origin of amphibians. 3. By dissecting frog experiments, students can further understand the frog’s morphological structure and learn to dissect frogs. The following suggestions are proposed for the teaching of amphibians: