问题 探究题

(6分)生物兴趣小组的同学在探究唾液对淀粉的消化作用时,设计并完成了如下实验:

(1)用试管1和2进行对照,实验组是(  ),该生物兴趣小组要探究的问题是(                            )。

(2)37度水域恒温模拟的是(     )。

(3)实验结果:试管1不变蓝,试管2( ),据此可以得出的结论是(         )。

(4)如果要进一步探究胃液对淀粉是否具有消化作用,需要设置试管3,该试管中加入的物质应为:淀粉糊2毫升+(         )。

答案

(1)①;淀粉的消化是否需要唾液的参与?;

(2)人体口腔温度;

(3)变蓝;唾液能将淀粉分解;

(4)胃液2毫升.

题目分析:(1)用试管①和试管②进行对照,实验组是①,对照组是②.探究的问题是淀粉的消化是否需要唾液的参与?

(2)酶的活性受温度的影响,高温和低温都会使酶的活性受到抑制;在人体内酶的活性最高,在37℃左右酶的催化作用最强,因此实验过程中应将装置放在37℃的水中进行水浴.

(3)淀粉遇碘变蓝色,麦芽糖遇碘不会变蓝.①号试管不变蓝,因为唾液中含有唾液淀粉酶,在条件适宜的情况下能将淀粉分解为麦芽糖.

(4)如果要进一步探究胃液对淀粉是否具有消化作用,需要设置试管③,该试管中加入的物质应为:淀粉糊2毫升+胃液2毫升,③和②形成对照.

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