苏教版小学科学四年级上册《吃的学问》教学实录.doc

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1、苏教版小学科学四年级上册吃的学问教学实录苏教版小学科学四年级上册吃的学问教学实录吃的学问教学实录一、谈话导入：俗话说：人是铁饭是钢，一顿不吃饿得慌。著名科学家袁隆平说过这样一句话：三天不吃饭，英雄变狗熊。吃在生活中非常重要。今天这节课，我们就一起来研究吃的学问。二、探索与调查（一）探究人为什么要吃食物及食物的分类1、谈话：从小到大，我们吃过许多各种各样的食物。那么，请同学们思考一下，人为什么要吃食物呢？2、了解学生经常吃的食物（1）问：刚才同学们讲得都很好，那么你们经常吃什么食物呢？你还吃过什么不同的食物？谁来补充？（2）这么多的食物，我们来用分类的方法把它们分一分，好不好？（3）小结：分类的

2、方法多种多样，一般我们把食物费为这么几大类（课件演示）主食类、蔬菜水果类、蛋奶类、鱼虾肉食类（二）了解食物中的营养成分及其作用（1）如果从营养学角度来分类，怎么分呢？请同学们打开课本，翻到第40页，自学P40-P41。同时思考：食物的主要营养成分有哪些？它们各有什么作用？（2）下面，我们把学习的情况交流一下。（三）研究各种食物中包含哪些营养成分（1）怎么才能知道食物中包含什么营养成分呢，我们可以用一些简单实用的方法来鉴定。通过课件演示，简介鉴定方法。（2）做实验时应该注意什么？课件演示（3）请大家按要求认真做实验。教师巡回指导，了解情况。（4）我们一起来交流一下实验情况（5）小结。小组内讨论，

3、交流汇报学生根据经验回答（面粉类、南瓜、大白菜、苹果、西瓜、青菜、马铃薯、猪肉、鸡肉、鱼、鸡蛋、牛奶、黄豆、山芋、大米类、萝卜、缸豆、豆油、色拉油等）学生分组讨论食物的分类然后全班交流、汇报学生自学P40-P41。全班交流、汇报并且板书学生看、听、用心记学生看、听、用心记学生分组实验、记录学生分组汇报三、总结延伸1、课件演示：按各种食物中的主要营养成分给食物分类。2、有没有一种食物含有人体需要的全部营养？3、在平时的饮食中应该注意什么呢？四、板书设计碳水化合物 构成人体的主要材料蛋白质 脂肪 供给能量维生素矿物质 促进生长发育、身体健康 水 结束语！祝大家学到有用的知识，提升自己的能力，实现自

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