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> 科学探究是学习和研究生物学的重要方法。下列关于“尝试探究水温对金鱼呼吸次数影响”实验的相关叙述中,正确的是A.实验过程中不需要用温度计测量水温的变化B.实验组和对照组除-八年级生物
科学探究是学习和研究生物学的重要方法。下列关于“尝试探究水温对金鱼呼吸次数影响”实验的相关叙述中,正确的是A.实验过程中不需要用温度计测量水温的变化B.实验组和对照组除-八年级生物
题目简介
科学探究是学习和研究生物学的重要方法。下列关于“尝试探究水温对金鱼呼吸次数影响”实验的相关叙述中,正确的是A.实验过程中不需要用温度计测量水温的变化B.实验组和对照组除-八年级生物
题目详情
科学探究是学习和研究生物学的重要方法。下列关于“尝试探究水温对金鱼呼吸次数影响”实验的相关叙述中,正确的是
A.实验过程中不需要用温度计测量水温的变化
B.实验组和对照组除水温外,其他条件应相同且适宜
C.实验完毕后,金鱼任其自生自灭
D.实验结论为水温的变化对金鱼呼吸次数没有影响
题型:单选题
难度:偏易
来源:不详
答案
B
试题分析:A、我们知道鱼类是变温动物,没有体温调节功能,其体温随外界水温高低而变化.因此,养鱼一定要注意水温.鱼的适温范围较大,0至30℃之间都可生活,最高极限水温是34℃,最适水温是20至28℃,所以实验时为了保证试验中数据的真实性,实验时温度要要用温度计测量水温.故A不符合题意.
B、对照实验是指在研究一种条件对研究对象的影响时,所进行的除了这种条件不同之外,其他条件都相同的实验.其中不同的条件就是实验变量.对照实验的设计原则是:一组对照实验中只能有一个变量,且只能以所研究的条件为变量,其它条件应相同.在“尝试探究水温的变化对金鱼呼吸次数的影响”时,实验的变量是温度,因此实验组和对照组除水温外,其他条件应相同且适宜.故B符合题意.
C、在探究不同水温对金鱼呼吸次数影响的实验后,由于金鱼仍然正常存活,生命面前是众生平等的,我们不能任其自生自灭,要继续饲养或放生.故C不符合题意.
D、通过实验,得出结论为水温的变化对金鱼的呼吸次数有影响.故D不符合题意.
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题目简介
科学探究是学习和研究生物学的重要方法。下列关于“尝试探究水温对金鱼呼吸次数影响”实验的相关叙述中,正确的是A.实验过程中不需要用温度计测量水温的变化B.实验组和对照组除-八年级生物
题目详情
答案
试题分析:A、我们知道鱼类是变温动物,没有体温调节功能,其体温随外界水温高低而变化.因此,养鱼一定要注意水温.鱼的适温范围较大,0至30℃之间都可生活,最高极限水温是34℃,最适水温是20至28℃,所以实验时为了保证试验中数据的真实性,实验时温度要要用温度计测量水温.故A不符合题意.
B、对照实验是指在研究一种条件对研究对象的影响时,所进行的除了这种条件不同之外,其他条件都相同的实验.其中不同的条件就是实验变量.对照实验的设计原则是:一组对照实验中只能有一个变量,且只能以所研究的条件为变量,其它条件应相同.在“尝试探究水温的变化对金鱼呼吸次数的影响”时,实验的变量是温度,因此实验组和对照组除水温外,其他条件应相同且适宜.故B符合题意.
C、在探究不同水温对金鱼呼吸次数影响的实验后,由于金鱼仍然正常存活,生命面前是众生平等的,我们不能任其自生自灭,要继续饲养或放生.故C不符合题意.
D、通过实验,得出结论为水温的变化对金鱼的呼吸次数有影响.故D不符合题意.