水往低处流,这是人尽皆知的道理,但各种植物是怎样把根部的水分提取到几米甚至几十米高的叶梢的呢?下面的实验可以解答这个问题。 到花园中摘几朵白色的鲜花,注意一定要连枝带叶一起摘,再找几根刚摘下的芹菜,将花茎和芹菜的根部修剪齐整。 在几只小碗中倒入清水,再分别滴上几 It is a well-known principle that water flows down, but how does a variety of plants extract water from roots to a few meters or even dozens of meters in height? The following experiment can answer this question. Pick a few white flowers in the garden. Be sure to pick the branches and leaves together. Then find a few freshly picked celery and trim the roots of the stems and celery. Pour some clear water in several small bowls and add a few drops.