在高二《生物学》（人教版）的绪论部分，唯一的一幅插图是“根的向他性和茎的背地性生长”图，图示了幼苗的茎和根在横放前后的向性变化，是对“生物体都具有应激性”这一基本特征的很好补充。但在教师讲解时，学生反应比较冷淡，因为对植物的向性现象早有所了解。正因如此，很多? In the introduction part of the second year of Biology (PEP), the only illustration is the “backward growth of roots and stems,” which shows the stalks and roots of the seedlings before and after lateral placement. The change of tropism is a good complement to the basic characteristic that organisms are “stressful.” However, when the teacher explained it, the student’s response was relatively cold because of the early understanding of the tropism of the plant. Because of this, a lot?