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  • 更新 2022-09-03
  • 科目 生物
  • 题型 综合题
  • 难度 中等
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30、Ⅰ为探究环境因素对植物光合作用强度的影响,设计进行如下实验:
实验材料和用具:图示实验装置(广口瓶容积为500mL)、100 mL量筒、200W的台灯、冷开水、不同浓度的NaHCO3溶液(冷开水配制)、黑藻等。实验重复三次,实验结果见下表。                                                                                                                                           
分析并回答下列有关问题:

(1)该实验中的自变量是           ,列出实验中的至少两个控制变量(无关变量):
                                       
(2)试补充完成该实验探究的具体实验步骤。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
①准备4套如图装置,编号为1----4,分别在各瓶中注入冷开水、0.1%NaHC03溶液、1.0%NaHC03溶液、5.0%NaHC03溶液各约500mL;
②取                                   ,分别放入各实验装置,并组装好实验装置;
③将4套装置            ,然后分别用                   
④30min后,                                      
⑶由于黑藻自身呼吸作用会消耗氧气,故量筒中收集到的水的体积
不能表示为黑藻30min内的光合总量,请根据上表绘制出相关的
柱形图。


Ⅱ植物的光合作用受内、外多种因素的影响,如图是在20℃、0.03%CO2浓度条件下,测得A、B两种植物在不同光照条件下光合速率变化曲线。请据图回答问题:
(1)图示表明      植物更适宜在弱光照条件下生长,这是由植物本身的             决定的。生产上如果将A、B共同种植,形成群落的        结构,将可达到充分利用光能的目的。
(2)在昼夜周期条件下(12h光照、12h黑暗),A植物需在光照强度___  __千勒克斯才能生长。
(3)当光照强度为8千勒克斯时,A植物每小时光合作用所制造的有机物量与B植物制造的有机物量的比例是        

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30、Ⅰ为探究环境因素对植物光合作用强度的影响,设计进行如下