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生物学是一门实验科学,传统教学侧重教材实验讲解,但在新课改形势下,教师应当引导学生置身实验,根据实际对生物实验进行改进,培养创新思维。下面,我就结合具体实验谈一谈:一、质量分数5%——6%的氯化钠溶液代替0.3g/ml的蔗糖溶液人教版高中生物教材(必修一P61)中《观察植物细胞吸水和失水实验》的步骤:首先,制作紫色洋葱鳞片叶外表皮细胞的临时装片,用低倍镜观察;其次,在盖玻片一侧滴加0.3g/ml的蔗糖溶液,观察
Biology is an experimental science. The traditional teaching focuses on the experiment of teaching materials. However, under the new situation of curriculum reform, teachers should guide students to experiment and improve the biological experiment according to the actual situation so as to foster innovative thinking. Next, I will talk about specific experiments: First, the mass fraction of 5% - 6% sodium chloride solution instead of 0.3g / ml of sucrose solution PEP teaching material (compulsory a P61) “observed plant cells Water absorption and water loss test ”steps: First, the production of purple onion squama leaf outer epidermal cells temporary loading, with a low magnification observation; Second, the side of the cover glass dropping 0.3g / ml sucrose solution was observed