Interaction & Interdependence C.9 Transfers of Energy & Matter (id: 8f61d3cbc)

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 requir:prbafh 4c k.wn4oj9:e inorganic carbon. In what forms5 ikxqa43 zj6g yp,iz/ is inorganic carbon present in aquatic ecosystems?z i6z/ix3ya4 kgjqp 5,

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 (H22​CO33​) 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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