我家门前的矮墙,被爬山虎的藤条缠得严严实实。每当我看到茂密的爬山虎,总是想:爬山虎为什么能紧紧地扒在墙上呢? 这学期,我学习了常识课文《植物的茎》,知道了爬山虎的茎是攀援茎,是靠“小手”扒在墙上的。可是它的“小手”究竟有什么秘密呢?为什么能紧紧地扒在竖直的墙上呢? 我考虑了很长时间,认为有三种可能:一是“小手”上有水蛭一样的吸盘,能紧紧地吸在墙上;二是“小手”上有 The low wall in front of my house was tightly covered with ivy canes. Whenever I saw the lush ivy, I always wondered why the ivy was clinging to the wall. This semester, I learned the common-sense text “Stems of Plants,” and knew that ivy stems are climbing stems, “Small hands” on the wall. However, what is the secret of “little hand”? Why can we squeeze it tightly on the vertical wall? I considered for a long time that there are three possibilities: first, there is a leech-like suction cup on “little hand” Can be sucked tightly on the wall; Second, “little hand” there