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农业害虫

农业害虫. —— 蝗虫. 探究一：. 参照书上 76 页图 3-32 ，观察蝗虫标本，回答问题： 1. 蝗虫身体分为几部分？ 2. 各部分有哪些结构？. 蝗虫的结构. 蝗虫的结构. 头部. 胸部. 腹部. 探究二. 参照书上 76 页图 3-33, 观察蝗虫口器，结合小词典回答问题 1. 蝗虫的口器由几部分组成？ 2. 它的口器有什么特点适合咀嚼植物的茎和叶？. 谈一谈. 这节课你有什么收获？.

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农业害虫

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  1. 农业害虫 ——蝗虫

  2. 探究一： 参照书上76页图3-32，观察蝗虫标本，回答问题： 1.蝗虫身体分为几部分？ 2.各部分有哪些结构？

  3. 蝗虫的结构

  4. 蝗虫的结构 头部 胸部 腹部

  5. 探究二 参照书上76页图3-33,观察蝗虫口器，结合小词典回答问题 1.蝗虫的口器由几部分组成？ 2.它的口器有什么特点适合咀嚼植物的茎和叶？

  6. 谈一谈 这节课你有什么收获？

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