有关不同条件下胚芽鞘如何生长的问题,是考查学生辨证思维的好题材,又是高考的一个重要考点。笔者在教学中发现,有很多学生对这一类问题常常感到晕头转向,甚至束手无 The question of how to grow the coleoptile under different conditions is a good subject for examination of students’ dialectical thinking and an important test point for the college entrance examination. In the teaching, the author found that many students often feel confused about this type of problem and even have no hands.