在“观察洋葱根尖的有丝分裂”一节教学中,通过学生课前培养洋葱根尖唤起学生的学习兴趣,导入新课;创设情境,探究实验过程;制作动画短片,突破重难点;提出问题,引导学生分析思考,完成一节课的教学。 In the teaching of “spotting the mitosis of the root tips of onion”, the students’ interest in learning the roots of the onion was taught before the class was introduced, and the new lesson was introduced; the situation was created and the experiment process was explored; animated short films were made and breakthroughs were made; Problems, guide students to analyze and think, complete the teaching of a lesson.