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> 某实验小组在探究“光对鼠妇生活的影响”时做了如下实验,请分析回答下列问题。(1)用硬纸板制成一个长方形的纸盒(上方没有盖),将纸盒分成长度相等的两部分,一部分用黑纸包好-七年级生物
某实验小组在探究“光对鼠妇生活的影响”时做了如下实验,请分析回答下列问题。(1)用硬纸板制成一个长方形的纸盒(上方没有盖),将纸盒分成长度相等的两部分,一部分用黑纸包好-七年级生物
题目简介
某实验小组在探究“光对鼠妇生活的影响”时做了如下实验,请分析回答下列问题。(1)用硬纸板制成一个长方形的纸盒(上方没有盖),将纸盒分成长度相等的两部分,一部分用黑纸包好-七年级生物
题目详情
某实验小组在探究“光对鼠妇生活的影响”时做了如下实验,请分析回答下列问题。
(1)用硬纸板制成一个长方形的纸盒(上方没有盖),将纸盒分成长度相等的两部分,一部分用黑纸包好形成一个黑暗的环境,另一部分不做处理。
(2)把纸盖静置桌上,并将抓来的10只鼠妇放入纸盖中央。
(3)10分钟后观察鼠妇的动向:移到黑暗一端多?还是移到亮处一端多?把纸盖一端用黑纸包好形成黑暗环境,另一端不做处理的目的是____________。10分钟后看到大多数鼠妇移到黑暗一端,据此能得出的结论是:______________。
(4)做实验时,小组成员要互相配合,有一名同学负责在纸盖黑暗的一端洒水,使它潮湿,而亮的一端也要洒水保持潮湿,其原因是__________________。
(5)实验中有的同学认为有一只鼠妇就能进行实验,可以吗?为什么?
题型:探究题
难度:中档
来源:0112 月考题
答案
(3)设置对照 光对鼠妇的生活有影响,鼠妇喜欢生活在黑暗的环境中。
(4)③鼠妇喜欢生活在黑暗潮湿的环境中,而光是变量,为了保持一个变量,所以两端都要洒水。
(5)不可以。数量少不具有普遍性,为了减少偶发事件对实验结果的影响,减小实验误差,所以要用多只鼠妇进行实验。
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题目简介
某实验小组在探究“光对鼠妇生活的影响”时做了如下实验,请分析回答下列问题。(1)用硬纸板制成一个长方形的纸盒(上方没有盖),将纸盒分成长度相等的两部分,一部分用黑纸包好-七年级生物
题目详情
(2)把纸盖静置桌上,并将抓来的10只鼠妇放入纸盖中央。
(3)10分钟后观察鼠妇的动向:移到黑暗一端多?还是移到亮处一端多?把纸盖一端用黑纸包好形成黑暗环境,另一端不做处理的目的是____________。10分钟后看到大多数鼠妇移到黑暗一端,据此能得出的结论是:______________。
(4)做实验时,小组成员要互相配合,有一名同学负责在纸盖黑暗的一端洒水,使它潮湿,而亮的一端也要洒水保持潮湿,其原因是__________________。
(5)实验中有的同学认为有一只鼠妇就能进行实验,可以吗?为什么?
答案
(4)③鼠妇喜欢生活在黑暗潮湿的环境中,而光是变量,为了保持一个变量,所以两端都要洒水。
(5)不可以。数量少不具有普遍性,为了减少偶发事件对实验结果的影响,减小实验误差,所以要用多只鼠妇进行实验。