問題詳情
42. In seed plants, which of the following is part of a pollen grain and has a functionmost like that of the seed coat?
(A) sporophyll
(B) sporopollenin
(C) stigma
(D) sporangium
參考答案
答案:[無官方正解]
難度:計算中-1
書單:沒有書單,新增
用户評論
【草薙素子】評論
(A) sporophyll(孢子葉):帶有孢子囊的葉子(B) sporopollenin(孢粉質):孢子和花粉外壁主要成分,堅韌穩定。(C) 柱頭(D) sporangium(孢子囊)