2019高考生物二轮复习专题二代谢第2讲细胞呼吸与光合作用第Ⅱ课时高考研究——教师为主导锁定高考范围备考更高效课件.ppt

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第 2 讲,细胞呼吸与光合作用,第课时 高考研究 教师为主导锁定高考范围,备考更高效,考点(一) 光合作用与细胞呼吸的影响因素及应用,师说考点,精研题点,锁定热点,03,考点(二) 光合作用及细胞呼吸的相关实验,师说考点,光照,不同温度可用不同恒温装置控制,温度,若确认CO2浓度对光合速率的影响,则应以不同浓度的CO2缓冲液为变量,若确认CO2是光合作用的原料,应以CO2有无(如添加NaHCO3还是添加NaOH设置对照实验)为变量,CO2,光照强度的大小可用不同功率的灯泡(或相同功率的灯泡,但与植物的距离不同)进行控制,黑暗条件下,装置甲中红色液滴左移的距离代表有氧呼吸消耗氧气的量。 适宜光照下,装置乙中红色液滴右移的距离代表净光合速率。 真正光合速率净光合速率呼吸速率,原理,净光合速率(zy)/2S;呼吸速率(xy)/2S; 真正光合速率净光合速率呼吸速率(xz2y)/2S,计算,实验过程,测定单位时间、单位面积叶片中淀粉的生成量,如图所示,以有机物的变化量测定光合速率(S为叶圆片面积),精研题点,锁定热点,03,提能增分检测,课堂巩固落实,谢,观,看,THANK YOU FOR WATCHING,谢,

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