一年级美术下册第17课《地下王国》课件湘美版.ppt

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以问题为抓手,蚂蚁结构,蚁穴结构,知识延伸,地下王国,作品欣赏,蚂蚁已经在地球上生活了上 亿年的时间了!在恐龙生活的那 个时代,有30厘米大的蚂蚁!但 在后来的进化过程中大的蚂蚁被 淘汰了,留下来的只有小蚂蚁!,超过了70亿只。 排成队可以围绕地球24圈,蚂蚁的种类相当丰富, 约有16000多种, 分布极为广泛。,有的蚂蚁捕食其他动物;有的吃叶子; 有的用特意收集的树叶堆肥,培植真菌 作食物。但蚂蚁大都喜欢带甜味的食品, 如食糖、蜂蜜、点心、饼干等。,一旦蚂蚁发现甜味食品,就会诱来 大批“部队”源源不断地搬运。,蚂蚁在巢外觅食时,总是用颚断断 续续地刺地,留下一条气味痕迹。其 目的是为了顺利返回巢穴以及为其它 蚂蚁指明路线。,大小穴室,通道,巴西一个错综复杂的地下蚂蚁王国 ,是世界上最大的蚁巢之一。,头,腹部,躯干,我也想像小蚂蚁一样,在地下王国学习、玩耍,真奇妙!,

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