被子植物根的形態(tài)和結(jié)構(gòu)

1、實(shí)驗(yàn)三 被子植物根的形態(tài)和結(jié)構(gòu)實(shí)驗(yàn)內(nèi)容1. 根尖的形態(tài)及分區(qū)2. 根的初生結(jié)構(gòu)雙子葉植物根的初生結(jié)構(gòu)單子葉植物根的初生結(jié)構(gòu)3. 雙子葉植物根的次生結(jié)構(gòu)4. 側(cè)根的發(fā)生5. 根瘤和菌根1. 根尖的形態(tài)及分區(qū)實(shí)驗(yàn)材料和方法蘿卜根尖從外部形態(tài)上觀察根尖4個(gè)分區(qū)的特點(diǎn)。小麥根尖縱切片觀察根尖各區(qū)的內(nèi)部結(jié)構(gòu)和細(xì)胞特點(diǎn)。思考：1）根毛是如何發(fā)生的？2）最短的根毛在什么部位？3）根尖各區(qū)在外部形態(tài)和內(nèi)部結(jié)構(gòu)上有無明顯的界限？蘿卜根尖的外部形態(tài)植物根尖縱切2.根的初生結(jié)構(gòu)-雙子葉植物實(shí)驗(yàn)材料和方法蠶豆幼根橫切片2. 根的初生結(jié)構(gòu)-單子葉植物實(shí)驗(yàn)材料和方法鳶尾根橫切片芋頭幼根橫切面臨時(shí)裝片（示凱氏點(diǎn)）鳶尾根橫切

2、片鳶尾根橫切片芋頭幼根橫切面臨時(shí)裝片（觀察凱氏點(diǎn)）3. 雙子葉植物根的次生結(jié)構(gòu)實(shí)驗(yàn)材料和方法桑老根橫切片桑老根橫切片木栓形成層桑老根橫切片維管形成層4. 側(cè)根的發(fā)生實(shí)驗(yàn)材料和方法蠶豆根橫切面切片 側(cè)根的發(fā)生5. 根瘤和菌根實(shí)驗(yàn)材料和方法根瘤：觀察花生、楹樹、田菁、紫云英等新鮮或液浸標(biāo)本。花生根瘤橫切片菌根：帶根的馬尾松幼苗松外生菌根橫切片根瘤豆科植物根瘤的形態(tài)花生根瘤橫切片松外生菌根實(shí)驗(yàn)報(bào)告1、繪鳶尾根橫切面（1/2）簡圖，示根的初生結(jié)構(gòu)。2、繪桑老根橫切面（1/2）簡圖，示雙子葉植物老根的次生結(jié)構(gòu)。實(shí)驗(yàn)材料1、蘿卜根尖2、洋蔥根尖縱切片3、蠶豆幼根橫切片（示根初生結(jié)構(gòu)及側(cè)根） 4、鳶尾根橫切

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