三年级科学下册动物的生命周期4蛹变成了什么课件3教科版.ppt

上传人:Iclinic170 文档编号:1207368 上传时间:2019-05-25 格式:PPT 页数:13 大小:2.12MB
下载 相关 举报
三年级科学下册动物的生命周期4蛹变成了什么课件3教科版.ppt_第1页
第1页 / 共13页
三年级科学下册动物的生命周期4蛹变成了什么课件3教科版.ppt_第2页
第2页 / 共13页
三年级科学下册动物的生命周期4蛹变成了什么课件3教科版.ppt_第3页
第3页 / 共13页
三年级科学下册动物的生命周期4蛹变成了什么课件3教科版.ppt_第4页
第4页 / 共13页
三年级科学下册动物的生命周期4蛹变成了什么课件3教科版.ppt_第5页
第5页 / 共13页
点击查看更多>>
资源描述

4、蛹变成了什么,蚕茧中又发生了什么变化呢?蛹又变成了什么?,蛹,蚕和蛹的比较,翅,体节,气门,蚕蛾的身体结构是怎样的?,头,胸,腹,足,触角,蚕身体分为头、胸、腹三部分,头部有一对触角,胸部有3对足。,蛾的头部呈小卵形,在头部两侧有一对大型复眼。 复眼由 3000多个小眼组成,一般为黑色,呈六角形,整齐排列成蜂巢状,为成虫的视觉器官,但只能识别1.4cm之内的物象。 复眼的前方有一对触角,由3040小节构成,每小节有2分支。雄蛾比雌蛾大,它是蚕蛾的嗅觉器官和触觉器官。,小知识,蛾交尾,蛾产卵,如何区别雌蛾和雄蛾,大,小,灰色,黑色,快,慢,雄蛾,雌蛾,蚂蚁、蜻蜓、蚕蛾有什么共同点?,共同点:都分头、胸、腹三部分,头上都有一对触角,胸部都有 三对足。,昆虫的共同特点:身体分头、胸、腹三部分,无骨骼,身体靠体表的硬壳支撑,分为卵、幼虫和成虫三个生长阶段,身体为多节状,头上有一对触角,胸部有 三对足。,蚂蚁、蜻蜓、蚕蛾都是昆虫。,一、填空题 1.头 胸 腹 触角 3 2.雄 雌 雌 二、选择题 1. 2. ,检查一下,

展开阅读全文
相关资源
猜你喜欢
  • SAE AMS 5842G-2016 Cobalt-Nickel Alloy Corrosion and Heat-Resistant Bars 19Cr - 36Co - 25Ni - 7 0Mo - 0 50Cb (Nb) - 2 9Ti - 0 20Al - 9 0Fe Vacuum Induction Plus Vacuum Consumable E.pdf SAE AMS 5842G-2016 Cobalt-Nickel Alloy Corrosion and Heat-Resistant Bars 19Cr - 36Co - 25Ni - 7 0Mo - 0 50Cb (Nb) - 2 9Ti - 0 20Al - 9 0Fe Vacuum Induction Plus Vacuum Consumable E.pdf
  • SAE AMS 5843G-2016 Cobalt-Nickel Alloy Corrosion and Heat-Resistant Bars 19Cr - 36Co - 25Ni - 7 0Mo - 0 50Cb (Nb) - 2 9Ti - 0 20Al - 9 0Fe Vacuum Induction Plus Vacuum Consumable E.pdf SAE AMS 5843G-2016 Cobalt-Nickel Alloy Corrosion and Heat-Resistant Bars 19Cr - 36Co - 25Ni - 7 0Mo - 0 50Cb (Nb) - 2 9Ti - 0 20Al - 9 0Fe Vacuum Induction Plus Vacuum Consumable E.pdf
  • SAE AMS 5844H-2014 Alloy Corrosion-Resistant Round Bars 20Cr - 35Ni - 35Co - 10Mo Vacuum Induction Plus Consumable Electrode Vacuum Remelted Solution Heat Treated and Work Strength.pdf SAE AMS 5844H-2014 Alloy Corrosion-Resistant Round Bars 20Cr - 35Ni - 35Co - 10Mo Vacuum Induction Plus Consumable Electrode Vacuum Remelted Solution Heat Treated and Work Strength.pdf
  • SAE AMS 5845J-2014 Alloy Corrosion-Resistant Round Bars 20Cr - 35Ni - 35Co - 10Mo Vacuum Induction Plus Consumable Electrode Vacuum Remelted Solution Heat Treated Work Strengthened.pdf SAE AMS 5845J-2014 Alloy Corrosion-Resistant Round Bars 20Cr - 35Ni - 35Co - 10Mo Vacuum Induction Plus Consumable Electrode Vacuum Remelted Solution Heat Treated Work Strengthened.pdf
  • SAE AMS 5846C-2011 Alloy Corrosion and Heat-Resistant Bars and Forgings 53Ni - 15Cr - 18 5Co - 5 0Mo - 3 2Ti - 4 2Al - 0 03B Double Vacuum Melted Solution Stabilization and Precipi.pdf SAE AMS 5846C-2011 Alloy Corrosion and Heat-Resistant Bars and Forgings 53Ni - 15Cr - 18 5Co - 5 0Mo - 3 2Ti - 4 2Al - 0 03B Double Vacuum Melted Solution Stabilization and Precipi.pdf
  • SAE AMS 5846D-2016 Alloy Corrosion and Heat-Resistant Bars and Forgings 53Ni - 15Cr - 18 5Co - 5 0Mo - 3 2Ti - 4 2Al - 0 03B Double Vacuum Melted Solution Stabilization and Precipi.pdf SAE AMS 5846D-2016 Alloy Corrosion and Heat-Resistant Bars and Forgings 53Ni - 15Cr - 18 5Co - 5 0Mo - 3 2Ti - 4 2Al - 0 03B Double Vacuum Melted Solution Stabilization and Precipi.pdf
  • SAE AMS 5848D-2009 Steel Corrosion-Resistant Bars Wire Forgings Extrusions Tubing and Rings Wear and Galling Resistant 8 0Mn C 4 0Si C 17Cr C 8 5Ni C 0 13N Solution Heat Treated (U.pdf SAE AMS 5848D-2009 Steel Corrosion-Resistant Bars Wire Forgings Extrusions Tubing and Rings Wear and Galling Resistant 8 0Mn C 4 0Si C 17Cr C 8 5Ni C 0 13N Solution Heat Treated (U.pdf
  • SAE AMS 5850D-2007 Steel Corrosion and Heat-Resistant Honeycomb Core Resistance Welded Square Cell《方形气孔蜂窝状核心阻力焊接的耐腐蚀和耐高温钢》.pdf SAE AMS 5850D-2007 Steel Corrosion and Heat-Resistant Honeycomb Core Resistance Welded Square Cell《方形气孔蜂窝状核心阻力焊接的耐腐蚀和耐高温钢》.pdf
  • SAE AMS 5853C-2006 Steel Corrosion and Heat-Resistant Bars and Wire 15Cr - 25 5Ni - 1 2Mo - 2 1Ti - 0 006B - 0 30V Consumable Electrode Melted 1800 (982 Solution Treated and Work-S.pdf SAE AMS 5853C-2006 Steel Corrosion and Heat-Resistant Bars and Wire 15Cr - 25 5Ni - 1 2Mo - 2 1Ti - 0 006B - 0 30V Consumable Electrode Melted 1800 (982 Solution Treated and Work-S.pdf
  • 相关搜索

    当前位置:首页 > 教学课件 > 中学教育

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1