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小朋友,如果问哪些动物会预报天气,你们一定会举出好多例子。比如蚂蚁搬家、蜻蜒低飞、泥鳅游到水面、乌龟背上出“汗”等,都是下雨的征兆。其实,在大自然中,许多植物也有预报天气的本领。有一种植物叫雨蕉,每逢下雨之前,由于气压低,空气中的湿度大,其体内的水分蒸发不出去,它宽大的叶面上便会渗出许多晶莹的水珠。所以,人们将它取名为雨蕉。一种叫青刚栎的树,会用叶子颜色的变化来预报阴晴。晴天的时候,由于叶子里所含的叶绿素较多,树叶呈绿色;下雨之前,天气闷热,叶绿素减少,花青素增多,叶子就会变成红色。小朋友熟悉的含羞草,更是灵敏
Children, if you ask which animals will forecast the weather, you will certainly cite many examples. Such as ants moving, dragonfly low, loach swim to the surface, turtle back out “Khan”, etc., are signs of rain. In fact, in nature, many plants also have the ability to forecast the weather. There is a plant called banana, before each rain, due to low pressure, the humidity in the air, the body’s water evaporation can not go out, it will be large leaves oozing many crystal beads. So, people named it banana. A tree called the oak tree, will use the color change of the leaves to predict the shade. In sunny weather, the leaves are green due to more chlorophyll contained in the leaves. Before the rain, the weather is hot and the chlorophyll is reduced. As the anthocyanins increase, the leaves turn red. Mimosa familiar children, it is more sensitive