本题目来源于试卷: Interaction & Interdependence C.9 Transfers of Energy & Matter，类别为 IB生物学
[单选题]
Aquatic autotrophs requt,bdydn4 i1 1uire inorganic carbon. In fg hq(7 ft5t6sbaq* i9what forms is inorganic carbon present i6qhbt9aff q7 t5(g is*n aquatic ecosystems?
A. Dissolved carbon dioxide and hydrogen carbonate ions
B. Dissolved carbon monoxide and calcium carbonate
C. Dissolved methane and glucose
D. Dissolved carbon dioxide and methane
参考答案: A
本题详细解析:
Explanation: Aquatic ecosystems take in inorganic carbon when carbon dioxide dissolves in water. Dissolved carbon dioxide can combine with water to form carbonic acid (H22CO33) which dissociates into hydrogen ions (H + ) and hydrogen carbonate ions (HCO33- ). So, inorganic carbon is present as both dissolved carbon dioxide and hydrogen carbonate ions in aquatic ecosystems. Carbon dioxide, not carbon monoxide (Choice B) is the form of inorganic carbon that autotrophs can use. Methane (Choice C and D) is a form of organic carbon, not inorganic carbon.
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