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“绿色植物的呼吸作用”是义务教育生物新课程标准(2011年版)第四个一级主题中的重要内容。“绿色植物的呼吸作用产生二氧化碳”、“绿色植物的呼吸作用消耗氧气”安排在第三单元第五章第二节(见人教版义务教育教科书生物学七年级上册第128页),这两个实验可以让学生获得绿色植物进行呼吸作用时所发生物质变化的直观认识。一、教材实验原型及不足之处1.教材实验原型。(1)绿色植物的呼吸作用产生二氧化碳。如图1所示,瓶中装的是清水萌发的种子,实验关闭棉花打开开始时阀门是关闭的。利用二氧化碳澄清使澄清的石灰水变的石
“The Respiration of Green Plants” is an important part of the fourth level theme of the new curriculum standard for compulsory education biology (2011 edition). “The Respiration of Green Plants Produces Carbon Dioxide”, “The Respiration of Green Plants Consumes Oxygen” is arranged in Chapter 3, Section 2, Section 3 (see People’s Education Edition, Compulsory Education Textbook Biology, Year 7, p. 128 ), These two experiments allow students to gain an intuitive understanding of the material changes that occur when a green plant breathes. First, the textbook experimental prototype and inadequate 1. Textbook experimental prototype. (1) Respiration of green plants produces carbon dioxide. Shown in Figure 1, the bottle is filled with water germination seeds, the experiment closed when the cotton is opened, the valve is closed. Make use of carbon dioxide to clarify the limestone to make it clear