七年级生物上册2.2.2《环境影响生物的生存》冬虫夏草资源拓展(新版)苏科版.doc

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1冬虫夏草冬虫夏草又叫虫草,是虫和草结合在一起长的一种奇特的东西,冬天是虫子,夏天从虫子里长出草来。虫是虫草蝙蝠蛾的幼虫,草是一种虫草真菌。怎么长出来的呢?夏季,蛾子将卵产于草丛的花叶上,随叶片落到地面。经过一个月左右孵化变成幼虫,便钻入潮湿松软的土层。土层里有一种虫草真菌的子囊孢子,它只侵袭那些肥壮、发育良好的幼虫。幼虫受到孢子侵袭后钻向地面浅层,孢子在幼虫体内生长,幼虫的内脏就慢慢消失了,体内变成充满菌丝的一个躯壳,埋藏在土层里。经过一个冬天,到第二年春天来临,菌丝开始生长,到夏天时长出地面,长成一根小草,这样,幼虫的躯壳与小草共同组成了一个完整的“冬虫夏草”。

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