试题与答案

木本茎的结构从外到内一般______形成层、木质部、髓.

题型:填空题

题目:

木本茎的结构从外到内一般______形成层、木质部、髓.

答案:

木本植物茎的结构从外到内依次是:树皮、形成层、木质部和髓.树皮有周皮和韧皮部组成,周皮其保护作用,韧皮部内有筛管和韧皮纤维,筛管可以运输有机物;再往里是形成层,形成层细胞可以分裂增生,向内产生木质部,向外产生韧皮部,使茎不断的加粗;木质部内有木纤维和导管.导管可以运输水分和无机盐,木纤维起支持作用;最里面是髓,储存营养物质.

故答案为:树皮.

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题型:填空题

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