問題詳情
38. 有關生態系中物質循環的敘述，下列何者最正確？
(A) 被子植物吸收二氧化碳後經光合作用形成碳水化合物，碳水化合物可再經由呼吸作用氧化形成二氧化碳，直接由葉脈末端排出
(B) 氮元素在自然界中相當豐富，故經氮循環以後，在土壤中會有豐富的氮元素
(C) 豆科植物根部多具有根瘤，內有藍綠菌共生，可以進行固氮作用，將氮轉化成植物可以吸收的銨鹽
(D) 土壤中缺氧時，脫氮細菌可進行代謝反應，將土壤中的硝酸鹽還原成氮氣，釋放回到大氣中
(A) 被子植物吸收二氧化碳後經光合作用形成碳水化合物，碳水化合物可再經由呼吸作用氧化形成二氧化碳，直接由葉脈末端排出
(B) 氮元素在自然界中相當豐富，故經氮循環以後，在土壤中會有豐富的氮元素
(C) 豆科植物根部多具有根瘤，內有藍綠菌共生，可以進行固氮作用，將氮轉化成植物可以吸收的銨鹽
(D) 土壤中缺氧時，脫氮細菌可進行代謝反應，將土壤中的硝酸鹽還原成氮氣，釋放回到大氣中
參考答案
答案：D
難度：簡單0.714286
統計：A(0),B(1),C(1),D(5),E(0)
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