【評論主題】20. About the nutrient translocation (source-sink) during photosynthesis, which one of the following

【評論內容】

(A)是透過主動運輸 active transport

(B)未成熟的葉是醣庫sink，成熟葉才是醣源source

(C)入sink時不需要耗費能量，屬被動運輸；是從source入sieve tube elements時才需要ATP

(E) 韌皮部醣濃度比頂端分生組織高