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高中生物实验中,有两种实验,一种是难于操作易于失败的实验,如用高倍显微镜观察植物细胞的有丝分裂;另一种是易于操作又易于失败的实验,如观察根对矿质元素离子的交换吸附现象。为搞好实验教学,我们对生物实验的一些操作进行了改进,起到了一定作用。 在生物实验中,染色时间的长短和药液浓度的不同将会产生不同效果,例如观察植物细胞的有丝分裂的实验过程中的染色,课本中规定用1％龙胆紫液染色3～5min,在实验中我们发现染色太深,很难看清细胞中染色体的变化情况,从而影响此实验的效果。为了解决这
In high school biology experiments, there are two kinds of experiments, one is that it is difficult to manipulate the experiments that are easy to fail, such as observation of mitosis of plant cells by high magnification microscope; the other is an experiment that is easy to operate and easy to fail, such as observing the root to the mineral element ions. Exchange adsorption phenomenon. In order to do a good job in experimental teaching, we have improved some of the biological experiments and played a role. In biological experiments, the length of staining time and the concentration of the drug solution will produce different effects. For example, the staining during the experimental process of mitosis observation of plant cells is stipulated in the textbook with 1% gentian violet for 3 to 5 minutes. In the experiment, we found that the staining was too deep and it was difficult to see the changes in the chromosomes in the cells, which affected the results of this experiment. To solve this