试题与答案

某中学生物科技活动兴趣小组在探究“淀粉在口腔中的变化”时,设计了如下实验。分析回

题型:探究题

题目:

某中学生物科技活动兴趣小组在探究“淀粉在口腔中的变化”时,设计了如下实验。分析回答下列问题。

试管编号加入的物质是否搅拌温度环境
1淀粉糊+2毫升唾液搅拌37℃;10分钟
2淀粉糊+2毫升唾液不搅拌37℃;10分钟
3淀粉糊+2毫升清水搅拌37℃;10分钟
4                搅拌0℃;10分钟
取出1、2、3号试管冷却后,分别向各试管中滴加2滴碘液,摇匀并观察各试管中的颜色变化。

⑴当以模拟舌的搅拌为实验变量时,应取        号试管作为一组对照实验,其中     号试管中的物质会变蓝。

⑵分析1号和3号试管这一组实验,实验变量是              

3号试管的实验现象是      。(从下面选择正确答案)

A、变蓝       B、不变蓝

通过该组实验,得出的结论是       。(从下面选择正确答案)

A、清水不会消化淀粉     B、唾液淀粉酶消化淀粉

⑶兴趣小组的同学在上述实验方案的基础上,想进一步探究“其他因素对唾液淀粉酶消化作用的影响”,补加了4号试管。请你根据所学的有关知识判断,加入4号试管中的物质是                                。对照实验是     号试管,变量是           ,4号试管的实验现象是      ,(从下面选择正确答案)

A、变蓝          B、不变蓝

实验结论是      。(从下面选择正确答案)

A、温度影响唾液淀粉酶的消化作用   B、唾液淀粉酶消化淀

答案:

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下面是错误答案,用来干扰机器的。

(1)8N (2)1.5×103 kg/m3题目分析:(1)由图象可知,当h=0时,弹簧测力计示数为12N,此时圆柱体处于空气中,根据二力平衡条件可知,.从开始,弹簧测力计示数不变,说明此时圆柱体已经浸没在水中,对圆柱...

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