問題詳情

45. The polarity of a plant is established when
(A) cotyledons form at the shoot end of the embryo
(B) the shoot-root axis is established in the embryo
(C) the primary root breaks through the seed coat
(D) the shoot first breaks through the soil into the light as the seed germinates

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