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【题目】根据探索生长素类似物促进插条生根的最适浓度的实验,回答下列问题:

(1)生长素处理插条的方法主要有_____________和沾蘸法。不论哪一种方法,处理的部位都是插条的基部。

(2)实验中应设置空白对照组,该组应用______________处理插条。

(3)实验中要设计多个实验组进行对比。若对要研究的植物有关情况所知不多,需先设计一组溶液浓度梯度_____________的预实验进行摸索,以确定最适浓度大致范围。

(4)实验中对插条处理的时间长短应一致,同一组实验中所用到的植物材料也应尽可能做到条件相同等等,这些做法的目的是控制实验中的______________,确保其相同。

(5)实验中不同浓度生长素类似物对插条的作用效果,可根据处理后插条的 情况来反应。

【答案】

(1)浸泡法

(2)蒸馏水

(3)比较大

(4)无关变量

(5)生根数目和生根长度

【解析】

(1)生长素处理插条的方法主要有浸泡法和沾蘸法。

(2)实验中应以蒸馏水处理插条来设置空白对照组。

(3)若对要研究的植物有关情况所知不多,需先设计一组溶液浓度梯度比较大的预实验进行摸索,以确定最适浓度大致范围。

(4)实验过程应该控制所有的无关变量一致。

(5)实验效果以插条的生根数目和生根长度来反应。

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