問題詳情
閱讀測驗三植物體在胚胎發育期間,幾乎是每一個細胞都可以分裂,但隨著植物體的發育,具有分裂能力的細胞,也隨之減少。在胚發育成幼苗以後,仍具有分裂能力的細胞群稱為分生組織。分生組織依其在植物體內位置不同,可分為頂端分生組織、側生分生組織和中間分生組織三類。頂端分生組織位於根及莖枝的尖端,稱之為生長點,具有細胞排列緊密、核大、細胞質濃密、液胞小等特性。側生分生組織由頂端分生組織發育而來,其位置與根或莖的表面平行,有維管束形成層和木栓形成層兩種,此二者皆為次生分生組織,具有細胞排列整齊、核小、液胞大等特性。中間分生組織(intercalary meristem)位於成熟組織之間。如位於禾本科植物的節間細胞群中,所以禾本科除頂端外,枝系其他區域也能生長,這對莖的增高有很大的影響。竹子屬於禾本科竹亞科,在熱帶地區的某類竹筍有一個晚上長高一公尺多的紀錄。禾本科植物葉的基部也都具有中間分生組織,在葉部發育過程有伸長的作用。草坪刈割後,葉片常常很快就再度長出,這並非由於新葉的形成,而是由被刈割的老葉伸長之故。葉的中間分生組織在基部,不但使被刈割後葉子迅速長出,也使禾草能忍受食草動物不斷的啃蝕。(改寫自葉育材等合譯之簡明植物生理學)
42.維管束形成層的組成細胞有哪些特性? (多選)
(A)細胞排列整齊
(B)核較大
(C)液胞較大
(D)細胞壁厚
(E)位置與根或莖的表面平行
42.維管束形成層的組成細胞有哪些特性? (多選)
(A)細胞排列整齊
(B)核較大
(C)液胞較大
(D)細胞壁厚
(E)位置與根或莖的表面平行
參考答案
答案:[無官方正解]
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)
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