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【教案】冀人版四年级科学下册全册教案word版(可下载打印)

  • 2026-04-02 18:59:19
【教案】冀人版四年级科学下册全册教案word版(可下载打印)

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1土壤的组成

教学目的

1.指导学生通过实验分析,知道土壤是由水、空气、砂、粘土以及腐殖质等主要成分组成,培养他们的分析综合能力。

2.培养学生认真细致,与人协作进行实验的良好习惯,提高学生学习科学的兴趣。

教学重点

指导学生认识土壤的成分。[来源:学科网]

教学难点

指导学生认识土壤的腐殖质成分。

教学过程

一)导入新课

:我们进行了课外土壤考察活动,采回了土壤的样品,现在谁能说一说什么是土壤?

:(

:请大家观察自己采集的土壤,想一想,你还想知道与土壤有关的哪些问题?

:(提出自己的问题

:很好!大家提出了想知道土壤为什么能生长植物?土壤里含有什么?为什么土壤里植物长得不一样?……这节课我们先研究土壤里究竟有什么?也就是土壤的成分。板书课题

(二)学习新课

1.土壤中有什么

比较同学们收集到的土壤有哪些不同

同学们看到的土壤是什么颜色?(褐色、黄色......)

土壤里有什么东西?沙粒、小石子、小树枝、烂树叶等丰生物;还有小虫子、微生物等生物)

土壤有什么味道?(腐臭、腥、清香...)

2.寻找土壤里含有水、空气。

a:根据你们的经验,你认为土壤里含有水吗?你怎样知道的?:土壤里含有水,我从……以下举实例

:大家都从土壤里潮湿的这一现象(板书)推断出土壤里含有水板书),很好,大家既注意现象,又从现象中思考出结论。

b:刚才,我们知道土壤里含有水。也就是说水是土壤的一种成分。土壤的成分还有什么?

:空气可能也是土壤的成分。

:!这位同学能大胆推测。你能想出一个办法,也就是设计一个实验,让大家看到土壤里含有空气吗?其他同学也可以相互议论,打算怎么做?那样做会发生什么现象?怎么从现象说明空气是土壤的成分?

:(议论实验的设计

:现在请同学们都说一说自己的设想。生:(汇报各自的设计方案

:(归纳学生的设计,同时清楚地讲述实验步骤和要求:(分组实验

:(巡视指导,了解学生情况

:现在,请同学汇报一下你怎么做的实验,看到什么现象?你想这些现象说明了什么?

:我把土块放入盛着水的杯子中,看到有许多小气泡从土块中冒出来,慢慢升到水面,从冒气泡的现象能说明土壤里含有空气。

:我也是那样做,我还看到气泡一个一个从土壤里钻出来,然后慢慢升上来……

:……

:许多同学的实验都设计得很好,而且有的观察得很仔细,大家都看到了冒气泡(板书,并且从冒气泡这一现象,分析得出土壤里含有空气(板书)。像刚才这样,通过实验观察到现象,再从现象分析得出结果(或叫结论),这就是平时我们常听过的实验分析方法。一齐说一遍。[来源:学科网ZXXK]

:实验分析方法。

[:实验较简易,学生又有较多的相关经验,教师鼓励学生自己设计实验,不但可行,而且能激发学习兴趣,还能让学生经历实验活动的全过程,长此以往,能提高学生的实验能力。[来源:学。科。网Z。X。X。K]

3.应用与拓展:提高土壤肥力的方法

在农业生产中,人们常常通过将农作物的秸秆、牲畜的粪便等“新成分”添加到土壤中来改善土壤结构、提高土壤肥力,使农作物生长得更好。

你知道哪些提高土壤肥力的方法吗?[来源:学§科§网Z§X§X§K]

生:秸秆还田用有机肥施化肥......

(三)巩固

:这节课我们通过实验分析,知道了土壤的成分是哪些?谁能说一说。

:(略

:我们都是怎样得到这些认识的?

:(略

:这是这节课所学到的内容,大家学得很认真。学习了土壤成分,我们就知道了土壤是地球表面的一层疏松的物质,由各种颗粒状矿物质、有机质、水分、空气、微生物等组成。

板书设计

[

土壤的组成

观察到的现象说明土壤中含有

潮湿

冒气泡空气

相关资源

小学科学冀人版通用教学资源包(1-6下册)。

链接:https://pan.quark.cn/s/1cdff6e62aaf

小学科学冀人版教学资源包 4年级下册

链接:https://pan.quark.cn/s/59107cebbf23

小学科学冀人版教学资源包 5年级下册

链接:https://pan.quark.cn/s/12621a7b262a

小学科学冀人版教学资源包 6年级下册

链接:https://pan.quark.cn/s/27caf24e0196

冀人版小学科学4年级下册试卷+习题

链接:https://pan.quark.cn/s/c0341a9e2111

冀人版小学科学5年级下册试卷+习题

链接:https://pan.quark.cn/s/22854bbf1069

冀人版小学科学6年级下册试卷+习题

链接:https://pan.quark.cn/s/2af1894a3add

注意:下载链接只能复制,无法直接点击,请复制链接,到微信里发给自己或自己的好友,即可点开下载链接;或者长按链接点击搜一搜之后访问页面。

(PS:小编在这里给大家推荐一家便宜快捷的网上打印店,小猴云印仅需5分/页,打印一本书也花不了几块钱,顺丰包邮到家!可扫描下方海报中二维码下单打印!)

重要说明

 所有文件版权归原作者所有,如有侵权可以联系本人删除。本公众号尊重版权,有任何版权问题,可以直接在公众号留言或添加小编VX(Xzch1980),我看到后会回复。

— END —

请点个在看谢谢鼓励哦

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  1. CONNECT:[ UseTime:0.000905s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000621s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001851s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.005846s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000545s ]
  6. SELECT * FROM `set` [ RunTime:0.005319s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000695s ]
  8. SELECT * FROM `article` WHERE `id` = 476691 LIMIT 1 [ RunTime:0.002513s ]
  9. UPDATE `article` SET `lasttime` = 1775564595 WHERE `id` = 476691 [ RunTime:0.012991s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000353s ]
  11. SELECT * FROM `article` WHERE `id` < 476691 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001819s ]
  12. SELECT * FROM `article` WHERE `id` > 476691 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.021117s ]
  13. SELECT * FROM `article` WHERE `id` < 476691 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.016004s ]
  14. SELECT * FROM `article` WHERE `id` < 476691 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008727s ]
  15. SELECT * FROM `article` WHERE `id` < 476691 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006979s ]
0.234439s