一、教材方法人教版七年级生物上册第127页“绿色植物与生物圈中的碳—氧平衡”中,设置了“光合作用产生氧气”的演示实验,该实验能够让学生获得光合作用产生氧气的直观而感性的认识,对学生理解绿色植物维持生物圈的碳氧平衡有重要意义。教材中的装置如图1所示。方法是:先用排水集气法收集金鱼藻产生的气体,然后用线香的复燃验证产生的气 First, the textbook method PEP Seventh grade biology on the first page 127 “green carbon and oxygen balance in the plant and biosphere ”, set the “photosynthesis oxygen” demonstration experiment, the experiment can enable students to obtain The intuitive and perceptual knowledge of oxygen produced by photosynthesis is of great significance to students’ understanding of the balance of carbon and oxygen in the biosphere. The device in the textbook is shown in Figure 1. The method is: first collect the gas produced by Ceratophyllum sp. using the drainage and gas collection method, and then verify the generated gas with the reactivation of the incense stick.