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一、该实验在教材中所处的地位与作用人教版生物教材七年级上册第三单元第五章第二节《绿色植物的呼吸作用》这节内容中《植物呼吸作用产生二氧化碳、消耗氧气》是两个教师演示实验。二氧化碳、氧气都是无色无味的气体,看不见摸不着,通过该演示实验可以让学生直观地感受到呼吸作用产生了二氧化碳,同时消耗了氧气,有利于帮助学生理解呼吸作用。这是一个非常重要的演示实验。二、实验原型及不足之处1.原理二氧化碳能使澄清石灰水变浑浊、氧气具有助燃的性质。
First, the experimental position in the textbooks and role in the human version of biology textbook seventh grade on the third unit of the fifth chapter second “respiration of green plants” in this section, “plant respiration produces carbon dioxide, oxygen consumption ”Two teachers demonstrate the experiment. Carbon dioxide, oxygen are colorless and odorless gas, can not see the touch, through the demonstration experiment allows students to intuitively feel the breathing produces carbon dioxide, while consuming oxygen, helps to understand the respiratory effects. This is a very important demonstration experiment. Second, the experimental prototype and deficiencies 1. Principle Carbon dioxide can clarify the lime water turbidity, oxygen has a combustion-supporting nature.