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高中生物教材中“植物细胞的失水与吸水实验”对学生来说是一个难点,表现在实验思路及实验操作上。在实验思路上,学生要能掌握实验探究的一般步骤、实验目的及实验原理等;在实验操作上必须能熟练操作显微镜,会制作临时装片,会撕取洋葱鳞片叶外表皮单层细胞等。因此,要想顺利有效地开展该节实验课,教师就必须做好大量的实验准备工作。
High school biology textbooks “plant cell dehydration and water absorption experiment ” is a difficult for students, manifested in experimental ideas and experimental operation. In the experimental train of thought, students should be able to master the general steps of experimental exploration, experimental objectives and experimental principles; in the experimental operation must be able to manipulate the microscope, will make temporary loading, will tear the onion scaly leaf epidermal monolayer cells . Therefore, in order to successfully carry out the experiment section of this section, teachers must do a great deal of experimental preparation.