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在生物教学中,有时教师在表达生物形态结构、大小和动物运动方式等时,往往感觉词不达意或欠准确,或过于繁琐。有时只是一个手势或动作不仅能表达出语言和文字难以展示的内容,而且能把抽象的内容变得更形象直观、更加生动,从而达到良好的效果。一、关于保卫细胞的结构在讲授气孔的张开与闭合时,将两手掌心面对学生,四指合拢与拇指分开形成半圆形,双手合在一起,掌中央拱起形成一个圆形开口,解释说明一个手掌代表一个保卫细胞,两个手
In biology teaching, sometimes teachers often feel that the words are not intended or inaccurate, or too cumbersome in expressing biological morphology and structure, size, and animal movement patterns. Sometimes just a gesture or gesture can not only express the language and text difficult to display content, but also the abstract content becomes more vivid, more vivid, so as to achieve good results. First, on the structure of the guard cells In the teaching of stomatal opening and closing, the two hands face the students palm, four fingers close together with the thumb to form a semicircle separately, hands together, palm arched to form a circular opening, Explain that one palm represents one guard cell, two hands