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生物学是一门以实验为基础的学科,实验教学在课堂教学中占有极其重要的地位。课堂演示实验教学是教师用演示的方法,结合课堂教学进行生物学实验,是一种直观的教学手段。演示实验要求实验可见度要高,实验结论最好由学生得出且具有较强的示范性和精确性等。人教版生物学教材七年级上册第三单元第四章第二节《绿色植物对有机物的利用》这节内容中“植物的呼吸作用产生二氧化碳”是一个重要的演示实验。该实验探究了生物体进行生命活动时,发生了某些物质变化,通过该演示实验可以让学生直观地感觉到呼吸作用产生了二氧化碳,有利于帮助学生理解呼吸作用,所以该实验是一个重要的必做
Biology is an experiment-based discipline. Experimental teaching plays an extremely important role in classroom teaching. Classroom demonstration experiment teaching is a method that teachers use to demonstrate. Combining class teaching with biology experiment is an intuitive teaching method. Demonstration experiments require that the visibility of the experiment is high, and the experimental results are best drawn by the students and have strong demonstration and accuracy. PEP Biology Textbook Grade 7 Book 3 Unit 4 Chapter 2 Section 2 “Utilization of Organic Materials by Green Plants” This section of the text “The respiration of plants produces carbon dioxide” is an important demonstration experiment. The experiment explored the occurrence of certain substance changes when living organisms carried out life activities. Through this demonstration experiment, students can intuitively feel that the respiration produces carbon dioxide, which helps students understand the respiration, so the experiment is an important one. Must do