七年级生物下册4.7.2探究环境污染对生物的影响课后拓展训练题(新版)新人教版.doc

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1、1第二节 探究环境污染对生物的影响达标自查1一般来说,酸雨的 pH值会_5.6(填:大于、等于或者小于) ,模拟酸雨对生物的影响这个实验中,要求“模拟酸雨”的 pH值控制在 4,说明“模拟酸雨”的酸性_。2有的地方生态环境很好,没有产生酸雨的条件,但是,环保部门却监测到有时有酸雨出现。你能说说这是怎么回事吗?3小丁做“酸雨对生物的影响”探究实验过程如下:要研究的问题:_。提出假设:酸雨对生物有影响。制定方案:(1)在一个花盆里播下 5粒大豆,等它们长成幼苗后做实验。(2)向食醋中加清水,做成“模拟酸雨” ,用 pH试纸测定它的 pH值在 4左右。(3)向花盆里的大豆幼苗喷洒“模拟酸雨” ,每天

2、一次,观察并记录实验现象。实验结果:花盆中大豆幼苗都死亡了。实验结论:酸雨对生物有影响。小丁“要研究的问题”是什么?请你补上。实验这样做对不对?若不对,请指出错误的地方。拓展探究4做“废电池对生物的影响”探究实验时,如果不小心皮肤被废电池内容物溅到了,应该立即_,实验结束后,还必须用肥皂_。在做“酸雨对生物的影响”模拟探究时,要注意不要让模拟酸雨溅到_上。从这里可以看出,做实验要注意_问题。5把模拟酸雨的 pH值控制在 4,这样做的目的是_。6下面是日常生活中见到的事例,请你对其中会污染环境的例子提出改正措施。事例 改正措施2参考答案第二节 探究环境污染对生物的影响1小于 大(或:更强)2外地的酸雨随气流飘到该地方。3要研究的问题:酸雨对生物有没有影响 实验这样做不对。错误在于:实验幼苗的数目太少,没有重复的实验组;没有进行对比实验。4用清水清洗 洗手 眼睛和皮肤 安全5让实验现象更明显6 (1)把痰、口香糖吐在纸巾里,放入垃圾箱或集中处理。 (2)应当把生活污水和人粪尿经过处理后再排放。 (3)把秸秆再利用,如作堆肥,作食用菌的培养材料等(或:切碎埋入地里作肥料) 。 (4)改用其他材料做的、能够多次使用的购物袋。 (5)把垃圾分类,尽量回收利用。

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