2022年2018济南版生物七年级上册2.2.1.2《无脊椎动物的主要类群》教案 .pdf

名师精编优秀教案生物圈中的动物2.2.1.2 无脊椎动物的主要特征一、教学目标1、描述蚯蚓的形态结构及运动方式。2、举例说出扁形动物、线形动物和环节动物的主要特征。二、课时安排1 课时三、教学重点扁形动物、线形动物和环节动物的主要特征；四、教学难点蚯蚓的形态结构及运动方式。五、教学过程（一）导入新课请同学们看猪肉绦虫成虫的标本，观察它的体形与腔肠动物水熄的体形有什么不同之处？对。这就是我们今天要学的又一类动物-扁形动物。（二）讲授新课探究一：扁形动物的主要特征阅读教材 74 页文字资料，思考：1.涡虫的形态特点？2.涡虫是如何摄食与消化的？3.涡虫是如何运动的？4.扁形动物的主要特征？名师精编优秀教案探究二：线形动物的主要特征阅读教材 74 页文字资料，思考：1.蛔虫体表的特点？具有什么作用？2.蛔虫是如何进行消化的？3.线形动物的主要特征？探究三：环节动物的主要特征阅读教材 75 76 页文字资料，思考：1、尝试描述蚯蚓的外部形态特点。2、用手触摸蚯蚓会有何感觉？3、尝试描述蚯蚓的运动方式。4、怎样区分蚯蚓的前后端。5、大雨过后蚯蚓为何爬出地面？6、环节动物的主要特征？（三）知识运用1蚯蚓的身体由许多彼此相似的_组成，属于环节动物2蚯蚓等环节动物共同具有的特征是（）A体表包有坚韧的外骨骼B身体由许多体节构成C身体里有脊柱D足和触角分节（四）归纳小结文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 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处3下列关于环节动物特征的叙述，正确的是（）A体表包裹着一层密不透水的角质层，起保护作用B身体由许多彼此相似的体节组成，靠刚毛或疣足辅助运动C身体有口无肛门，食物残渣由口排出体外D身体和附肢都分节，提高了运动能力六、板书设计第二章生物圈中的动物第一节无脊椎动物的主特征一、扁形动物的主要特征身体背腹扁平，左右两侧对称；有口，无肛门；多营寄生生活二、线形动物的特征身体一般为圆柱形，体内有完整的消化道；消化管的前端有口，后端有肛门三、环节动物的主要特征身体分节无附肢（无足）细长而柔软；大多为蠕动爬行（依靠刚毛和肌肉运动）七、作业布置请围绕蚯蚓，简要回答问题：（1）蚯蚓、水蛭和沙蚕都属于环节动物，它们的身体由许多_构成，有体腔（2）在“观察蚯蚓”实验中，蚯蚓在粗糙的纸板上比在光滑玻璃板上运动的_，原因是纸板粗糙，摩擦力较大，有利于 _附着 在实验过程中，要使蚯蚓的体壁始文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 ZL1W4H10T4Z8文档编码:CH9Y9E9W8Q8 HM7E7F8O5U7 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