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人教版义务教育教科书八年级上册生物学第一章第二节安排了“饲养和观察蚯蚓”的学生实验,目的是引导学生观察蚯蚓的外部形态以及比较蚯蚓在糙纸上与玻璃板上的快慢程度。我在指导学生做这个实验的过程中,经常发现有些实验现象与书本上列举的实验现象不相符。经过仔细反复观察,认真分析归纳,现将该实验中易出现的几个常见问题及改进措施列举如下。问题1.用手直接抚摸蚯蚓难以感知体表刚毛的存在原因:蚯蚓体形太小。
People’s Education Edition compulsory education textbooks eighth grade biology on the first chapter second chapter arranged “feeding and observation of earthworms ” students experiment, the purpose is to guide students to observe the external morphology of earthworms and earthworms on rough paper and glass On the level of speed. In guiding my students to do this experiment, I often find that some of the experimental phenomena do not correspond to the experimental phenomena listed in the book. After careful and repeated observation, careful analysis and induction, now the experiment prone to several common problems and improvements are listed below. Question 1. Hand touching the earthworm is difficult to perceive the existence of surface bristles reasons: earthworm shape is too small.