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幼儿园教师蜗牛的秘密_科学_中班_教案+PPT课件备课图片

  • 2026-04-04 10:24:56
幼儿园教师蜗牛的秘密_科学_中班_教案+PPT课件备课图片

蜗牛的秘密

 科学

活动目标

l萌发探究蜗牛的兴趣,懂得爱护小动物。

l了解蜗牛触角、壳和腹足的作用,以及蜗牛的生活习性(如食性、行动方式)。

l尝试用工具对蜗牛进行简单观察,能用语言描述蜗牛的特点。

活动重难点

l重点:尝试用工具对蜗牛进行简单观察,能用语言描述蜗牛的特点,萌发探究蜗牛的兴趣。

l难点了解蜗牛触角、壳和腹足的作用,以及蜗牛的生活习性(如食性、行动方式)。

活动准备

l课件准备:《蜗牛的秘密》PPT。

l材料准备:活体蜗牛(提前在种植区或湿润草丛中寻找,确保安全无毒)、透明观察盒(带透气孔)、放大镜、菜叶。

活动过程

一、谜语导入,引出蜗牛。

——老师有一个谜语想请小朋友们猜:没有脚,没有手,背着房子到处走。下雨天,它出门,晴天躲在屋檐下。猜一种动物,你们知道是谁吗?

——谜底就是我们在种植园常见到的蜗牛!今天蜗牛宝宝来和我们做朋友啦!我们一起探索蜗牛的秘密吧!

二、了解蜗牛的外形及其作用。

1.幼儿分组观察,与同伴交流发现。

——老师请来了几只蜗牛朋友,小朋友们可以用放大镜仔细观察,但是不能用手碰蜗牛和蜗牛的盒子。蜗牛的胆子很小,一旦感觉到有危险就会立马躲进壳里,小朋友们就观察不到了。

——观察的时候可以仔细看看蜗牛的身体是由哪些部分组成的?

——它的头上有什么?它是怎么移动的?它的壳是什么样子的?它是怎么吃东西的?

Ø活动建议1.有条件的教师可投放活体蜗牛供幼儿观察,确保幼儿不将蜗牛放入口中,观察后彻底洗手;对害怕蜗牛的幼儿给予鼓励,允许远距离观察;活动后及时将蜗牛放回自然栖息地,或在自然角创设适宜的饲养环境。2.若没有准备活体蜗牛可观看蜗牛视频,集中观察。

2.师幼共同梳理,分享发现,了解蜗牛身体结构的秘密。

1)触角

——数一数蜗牛头上有几对触角?它们有什么不同?(两对,一对长一对短)

——猜一猜它们有什么用途?

小结:蜗牛的头上有两对触角,长触角上是蜗牛的眼睛,短触角像是蜗牛的“鼻子”,可以感知气味。但是蜗牛是个近视眼,它的眼睛看不清东西,所以它主要是靠短触角去感知气味寻找食物的。

2)嘴巴、牙齿

——当蜗牛找到食物后是怎么吃东西的呢?你们有观察到吗?

——蜗牛的嘴巴在哪里?

小结:蜗牛的嘴巴就在短触角的下面,别看它的嘴巴小,却有着上万颗牙齿,密密麻麻地长在舌头上,是世界上牙齿最多的动物。

3)壳

——蜗牛的壳是光滑的还是粗糙的?有花纹吗?像什么?(光滑的;有螺旋花纹;像棒棒糖/冰激凌筒)

——我们伸出小手来画一画蜗牛的壳。

——蜗牛的壳是做什么用的?(保护身体、躲避危险)

小结:蜗牛的壳就像它的“安全小屋”,当遇到危险时,蜗牛会“咻——”地缩进壳里,壳硬硬的,可以保护它软软的身体。

4)腹足

——你们有观察到蜗牛是怎么移动的吗?靠哪里移动?

——蜗牛是用腹部移动的,相当于我们人类的肚子,我们走路用脚,还要穿鞋,蜗牛用肚子走路,为什么它的肚子不会磨破呢?

——仔细看,蜗牛走过的地方,都留下了透明的黏液,正是这个黏液保护了它的肚子。

小结:蜗牛用腹足爬行,黏液能帮助它爬行,同时还能保护身体不被粗糙的地面划伤。

三、了解蜗牛的生活习惯。

——刚刚我们一起观察了蜗牛的外壳和它柔软的身体,接下来,我们一起了解一下蜗牛平时是怎么生活的吧!

1.了解蜗牛的居住环境。

——猜猜这些地方中,哪些会是蜗牛的“家”?

——想一想,平时你们经常在哪些地方发现蜗牛的身影?

小结:蜗牛喜欢湿湿的、凉快的地方,比如草丛里、石头缝、矮小的植物上。蜗牛害怕阳光所以它白天会躲在没有阳光潮湿的地方,等到晚上再出来活动。

2.了解蜗牛的饮食习惯。

——蜗牛会爱吃什么呢?

——我们来喂一喂。

小结:蜗牛爱吃新鲜的蔬菜、水果和嫩叶,不喜欢吃肉、面包、饼干这些干干的东西。蜗牛最怕盐!如果撒盐在它身上,它的身体会“融化”(脱水),所以千万不要喂咸的食物!

四、如何饲养一只蜗牛?

师幼讨论,结合思维导图,共同制定饲养计划。

——我们了解的蜗牛及它的生活习惯,如果想要再请蜗牛来班级做客,在自然角饲养蜗牛,我们要做些什么呢?

——要为蜗牛准备什么样的家?要准备哪些食物?要如何照顾蜗牛?有哪些注意的事情呢?

小结:要为蜗牛准备一个阴暗潮湿的家,准备水果、蔬菜和嫩叶等食物,平常还需要关注温度,保持湿润的环境,避免阳光直射。

Ø活动建议:引导幼儿回顾所学,结合蜗牛的生活习惯、喜好,从住所准备、食物准备、日常照顾、注意事项等方面讨论。

活动延伸

l日常活动

在自然角饲养蜗牛,引导幼儿照顾、喂养蜗牛,观察其进食、排泄过程等。

l家园共育

鼓励家长在日常生活中支持幼儿对蜗牛的持续性观察与探究,查阅蜗牛相关的资料,阅读蜗牛相关绘本

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  1. CONNECT:[ UseTime:0.000610s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000966s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.011714s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000324s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000747s ]
  6. SELECT * FROM `set` [ RunTime:0.002031s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000788s ]
  8. SELECT * FROM `article` WHERE `id` = 475298 LIMIT 1 [ RunTime:0.000503s ]
  9. UPDATE `article` SET `lasttime` = 1775804946 WHERE `id` = 475298 [ RunTime:0.015810s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000334s ]
  11. SELECT * FROM `article` WHERE `id` < 475298 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000513s ]
  12. SELECT * FROM `article` WHERE `id` > 475298 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001383s ]
  13. SELECT * FROM `article` WHERE `id` < 475298 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002795s ]
  14. SELECT * FROM `article` WHERE `id` < 475298 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001744s ]
  15. SELECT * FROM `article` WHERE `id` < 475298 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000700s ]
0.108081s