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观察植物根对矿质元素离子的交换吸附实验是重点实验之一。几年来,尽管我们坚持分组实验,但毕竟只是一次,而且做不到人人动手。如果人人动手,每班50人烧杯就需200个,效果不理想,不能达到每个学生都能熟练掌握此实验的目的。经我们长时间摸索认为,采用两结合法即课内课外结合、校内校外结合可收到十分满意的效果。我们曾用此法对安达市一中4个班200名学生作了试验。经逐一严格考核,98%学生达到熟练掌握的程度。
One of the key experiments was to observe the exchange adsorption experiments of plant roots on mineral element ions. In the past few years, despite our insistence on grouping experiments, it was only once and it was impossible for everyone to do it. If everyone starts, 200 people per class will need 200 beakers. The effect is not ideal, and each student can not master this experiment. After a long period of groping, we believe that the use of the two-in-one combination method, that is, the combination of extra-curricular activities and off-campus off-campus collaboration, can achieve very satisfactory results. We have used this method to test 200 students in 4 classes in Anda City. After rigorous assessment, 98% of students achieved proficiency.