我们有时会在屋顶上、树缝里,甚至是峭壁间发现植物,是谁把它们种在那儿的呢?是植物自己,你觉得奇怪吗?有些植物如蒲公英、杨树和柳树,它们的种子像一把小小的伞,可以随风飘荡。还有些植物的种子是靠风力滚动的,如风滚草。每到秋天成熟季节,风滚草便会卷成球形,在风中一边滚动一边随地撒落种子,好像一台自动播种机。还有些植物种子通过水路旅行。如椰子树,它的果实成熟后就滚入海中,随海水漂流到适宜的地方 We sometimes find plants on the roofs, in the crevices, or even on the cliffs, who planted them there? Are they plants, are you surprised? Some plants, such as dandelions, poplars and willows, have seeds that resemble The little umbrella, you can wind drift. Some plants also rely on the wind to roll the seeds, such as tumbleweed. Every twentieth century ripening season, tumbleweed will be rolled into a ball, while rolling in the wind while falling seeds, like an automatic seeder. Some plant seeds travel by water. Such as coconut trees, its fruit into the sea after the ripe, drifting with the sea to the right place