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植物報告 PowerPoint PPT Presentation


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植物報告. 商萓製. 植物的種子:. 每一個胚珠經過受精作用後方可發育成一粒種子,大多數的種子是由種皮、胚乳和胚三部分所組成。如同植物體的其它器官,各種不同的植物其種子的數目、大小、色澤、質地、形狀也不盡相同。植物界中所謂的單子葉植物和雙子葉植物,就是根據胚中子葉的數目而定的。種子可幫助植物渡過許多不良的環境,進而達到繁殖後代的結果。種子的構造大致可分成兩大類,以下分別陳述之:  雙子葉植物 具有兩片子葉及胚芽、種皮。  單子葉植物 具有一片子葉及胚乳、種皮。 植物種子剖面圖. 植物種子剖面圖. 植物的花:.

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植物報告

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