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2011年江苏省学业水平测试(必修科目)生物试卷考查了一道关于“植物细胞的质壁分离和复原”的实验题,与常规实验不同,题中的选材用的是洋葱鳞片叶无色的内表皮细胞而非紫色的外表皮细胞,实验试剂选用的是一种红色的胭脂红溶液而非蔗糖溶液,这道实验题设计新颖,构思巧妙,引发了不少讨论.1.原题呈现为了观察植物细胞质壁分离和复原的现象,某同学设计并进行了如下实验:材料用具:洋葱;刀片,镊子,滴管,载玻片,盖玻片,吸水
2011 Jiangsu province academic proficiency test (compulsory subjects) biological test papers examines a “plant wall plasmolysis and recovery ” experimental questions, and conventional experiments, the question of the selection is the use of onion scales colorless leaves Of the inner epidermal cells rather than purple outer skin cells, the experimental reagent is selected a red carmine solution rather than sucrose solution, this experimental design novel, clever idea, triggered a lot of discussion. In order to observe the phenomenon of plant cell wall separation and recovery, a classmate designed and conducted the following experiments: Materials and equipment: onion; blade, tweezer, dropper, slide, cover glass,