2.2《校园里的动物》22张ppt课件
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课件22张PPT。校园里的动物仔细观察蜗牛，看它有什么特点？ 蜗牛腹部上有扁平的足、尾，头部上长着一前一后两对像天线一样的触角，前面的小，后面的大，后面的一对触角上长着一对眼睛，背上驮着一个螺旋形的贝壳。蜗牛是怎样出壳的？蜗牛是怎样爬行的？ 蜗牛的肚子下的扁平的足实际上是一条条横纹，这些横纹像水波纹一样向后波动着，蜗牛就靠着横纹的波动，慢慢爬行。蜗牛的足里面有个叫“足腺”的小东西，能分泌一种粘液帮助它爬行。蜗牛吃什么？蜗牛通常栖息在温暖而阴湿的环境中：
主食各种蔬菜、杂草和瓜果皮；农作物的叶、茎、芽、花、多汁的果实等。
在寒冷的冬季和炎热干燥的夏季：
蜗牛能够分泌黏液，将壳口
封闭，不吃不动，在枯叶或
瓦砾堆中冬眠或夏眠。蜗牛有触觉和嗅觉吗？用你的棉签后端分别轻触蜗牛的触角、足、壳和躯干等部位蜗牛会有反应吗？哪个部位最敏感？
用棉花蘸一点醋或酒精，
靠近蜗牛的头部，蜗牛
有反应吗？蜗牛有视觉和听觉吗？让蜗牛在黑暗处下爬行3分钟后，用手电筒从正面照射蜗牛的头部，仔细观察蜗牛怎样行动？
离正在爬行的蜗牛前方
0.5米处，用力鼓掌，观
察蜗牛有没有反应？结论： 蜗牛有视觉、触觉、嗅觉， 没有听觉。蚂蚁的身体结构 触角
（一对）头胸 足
（三对）腹蚂蚁家族 蚂蚁喜欢成群结队地住在一起，寻找食物时会单走开。
在一窝蚂蚁中，蚂蚁分别有工蚁、雄蚁和雌蚁三种；工蚁雄蚁雌蚁有趣的蚂蚁 蚂蚁喜欢吃的食物是甜味食物，如白糖和面包屑等。
蚂蚁寻食的情况非常有趣：
如果嗅到甜味，先是用腿试探一下食物，它就会吃起来，并会试图把食物拖走。
而且蚂蚁是用触须交谈的。http://shop.99114.com/43697396
http://shop.99114.com/51425273
http://shop.99114.com/51420693
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http://shop.99114.com/47913051蚂蚁在交谈蚂蚁搬食物蚂蚁间的斗争把不同窝的蚂蚁放在一起，它们的触角一碰，就立刻咬杀起来；
把同窝蚂蚁放在一起，它们相遇以后，不但不打不咬，还能互相喂食。 你喜欢哪种鱼类，它们有什么共同特征？鱼的特征：身上布满鳞片，用鳃呼吸，用鳍运动。 躯干尾部胸鳍腹鳍臀鳍尾鳍背鳍头部小动物的共同特征： 它们都需要呼吸、喝水、吃东西；都会长大、繁殖；对刺激有反应；都会运动……认识这些动物；请给下面的动物分类：家鸽螳螂海鸥斑马大象乌龟娃娃鱼蛇大熊猫蜻蜓蛙一些简单的分类方法：分类一：
会飞的：家鸽、螳螂、海鸥、蜻蜓；
不会飞的：斑马、大象、乌龟、娃娃鱼、蛇、大熊猫、蛙。分类二：
没有脚的：蛇；
有 脚 的：家鸽、螳螂、海鸥、蜻蜓、蛙、斑马、大象、乌龟、娃娃鱼、大熊猫。比较科学的分类方法：哺乳类：斑马、大象、大熊猫；
爬行类：乌龟、蛇；
两栖类：娃娃鱼、蛙；
鸟 类：家鸽、海鸥；
昆虫类：螳螂、蜻蜓。
主食各种蔬菜、杂草和瓜果皮；农作物的叶、茎、芽、花、多汁的果实等。
在寒冷的冬季和炎热干燥的夏季：
蜗牛能够分泌黏液，将壳口
封闭，不吃不动，在枯叶或
瓦砾堆中冬眠或夏眠。蜗牛有触觉和嗅觉吗？用你的棉签后端分别轻触蜗牛的触角、足、壳和躯干等部位蜗牛会有反应吗？哪个部位最敏感？
用棉花蘸一点醋或酒精，
靠近蜗牛的头部，蜗牛
有反应吗？蜗牛有视觉和听觉吗？让蜗牛在黑暗处下爬行3分钟后，用手电筒从正面照射蜗牛的头部，仔细观察蜗牛怎样行动？
离正在爬行的蜗牛前方
0.5米处，用力鼓掌，观
察蜗牛有没有反应？结论： 蜗牛有视觉、触觉、嗅觉， 没有听觉。蚂蚁的身体结构 触角
（一对）头胸 足
（三对）腹蚂蚁家族 蚂蚁喜欢成群结队地住在一起，寻找食物时会单走开。
在一窝蚂蚁中，蚂蚁分别有工蚁、雄蚁和雌蚁三种；工蚁雄蚁雌蚁有趣的蚂蚁 蚂蚁喜欢吃的食物是甜味食物，如白糖和面包屑等。
蚂蚁寻食的情况非常有趣：
如果嗅到甜味，先是用腿试探一下食物，它就会吃起来，并会试图把食物拖走。
而且蚂蚁是用触须交谈的。http://shop.99114.com/43697396
http://shop.99114.com/51425273
http://shop.99114.com/51420693
http://shop.99114.com/51421772
http://shop.99114.com/51413947
http://shop.99114.com/51411731
http://shop.99114.com/51428700
http://shop.99114.com/51126970
http://shop.99114.com/51411785
http://shop.99114.com/50571701
http://shop.99114.com/51396679
http://shop.99114.com/49079032
http://shop.99114.com/51428051
http://shop.99114.com/51424545
http://shop.99114.com/51424410
http://shop.99114.com/50662675
http://shop.99114.com/50607906
http://shop.99114.com/50642953
http://shop.99114.com/51423520
http://shop.99114.com/51412862
http://shop.99114.com/51396195
http://shop.99114.com/50565948
http://shop.99114.com/51418078
http://shop.99114.com/50659681
http://shop.99114.com/50667689
http://shop.99114.com/49696333
http://shop.99114.com/50668750
http://shop.99114.com/51415013
http://shop.99114.com/50657072
http://shop.99114.com/51426863
http://shop.99114.com/50901448
http://shop.99114.com/51416045
http://shop.99114.com/51417275
http://shop.99114.com/51431960
http://shop.99114.com/50672571
http://shop.99114.com/50730736
http://shop.99114.com/43628012
http://shop.99114.com/51418359
http://shop.99114.com/51425046
http://shop.99114.com/50532544
http://shop.99114.com/50523413
http://shop.99114.com/51429014
http://shop.99114.com/51413479
http://shop.99114.com/51427915
http://shop.99114.com/51427705
http://shop.99114.com/51408812
http://shop.99114.com/51420078
http://shop.99114.com/51425252
http://shop.99114.com/51428015
http://shop.99114.com/50509333
http://shop.99114.com/50627589
http://shop.99114.com/51432440
http://shop.99114.com/51409460
http://shop.99114.com/51426945
http://shop.99114.com/48224893
http://shop.99114.com/48378030
http://shop.99114.com/50509974
http://shop.99114.com/50853036
http://shop.99114.com/51239866
http://shop.99114.com/51413418
http://shop.99114.com/50854169
http://shop.99114.com/50572207
http://shop.99114.com/50523591
http://shop.99114.com/50299153
http://shop.99114.com/50655761
http://shop.99114.com/50659840
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http://shop.99114.com/48897289
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http://shop.99114.com/49089296
http://shop.99114.com/50641100
http://shop.99114.com/50573772
http://shop.99114.com/50475719
http://shop.99114.com/50651985
http://shop.99114.com/47371513
http://shop.99114.com/50479401
http://shop.99114.com/50508974
http://shop.99114.com/47774880
http://shop.99114.com/50284444
http://shop.99114.com/48937324
http://shop.99114.com/49089530
http://shop.99114.com/50508505
http://shop.99114.com/47900320
http://shop.99114.com/49763995
http://shop.99114.com/50644315
http://shop.99114.com/50636516
http://shop.99114.com/48102939
http://shop.99114.com/50613004
http://shop.99114.com/48103150
http://shop.99114.com/42333072
http://shop.99114.com/47808814
http://shop.99114.com/48124341
http://shop.99114.com/47913051蚂蚁在交谈蚂蚁搬食物蚂蚁间的斗争把不同窝的蚂蚁放在一起，它们的触角一碰，就立刻咬杀起来；
把同窝蚂蚁放在一起，它们相遇以后，不但不打不咬，还能互相喂食。 你喜欢哪种鱼类，它们有什么共同特征？鱼的特征：身上布满鳞片，用鳃呼吸，用鳍运动。 躯干尾部胸鳍腹鳍臀鳍尾鳍背鳍头部小动物的共同特征： 它们都需要呼吸、喝水、吃东西；都会长大、繁殖；对刺激有反应；都会运动……认识这些动物；请给下面的动物分类：家鸽螳螂海鸥斑马大象乌龟娃娃鱼蛇大熊猫蜻蜓蛙一些简单的分类方法：分类一：
会飞的：家鸽、螳螂、海鸥、蜻蜓；
不会飞的：斑马、大象、乌龟、娃娃鱼、蛇、大熊猫、蛙。分类二：
没有脚的：蛇；
有 脚 的：家鸽、螳螂、海鸥、蜻蜓、蛙、斑马、大象、乌龟、娃娃鱼、大熊猫。比较科学的分类方法：哺乳类：斑马、大象、大熊猫；
爬行类：乌龟、蛇；
两栖类：娃娃鱼、蛙；
鸟 类：家鸽、海鸥；
昆虫类：螳螂、蜻蜓。