三年级下册科学课件------2.2认识其它动物的卵-------教科版知识分享.ppt

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1、单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,第二单元动物的一生,认识其它动物的卵,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,不同动物的卵一样吗？,蜗牛卵,青蛙卵,蚕卵,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2

2、011 Aspose Pty Ltd.,动物的卵里都有什么呢？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,探索一,观察不同动物的卵，与蚕卵比较有什么相同和不同？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,分类标准,Eva

3、luation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,探索二,观察鸡蛋内部的结构,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,打开一枚生的鸡蛋，与熟鸡蛋比较，我们还能发现什么？,Evaluation only.,Created with A

4、spose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,推测鸡蛋各部分的作用,含有营养物质和水分，供胚胎发育的需要,卵细胞的主要营养部分，外面包裹着卵黄膜,保护作用,提供空气,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,鸡蛋的哪一部分将发育成小鸡？,蛋黄,胚,蛋壳,胚,将发育成,小鸡,Evalua

5、tion only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,坚持观察，及时记录蚕的生长变化。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,

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