Interaction & Interdependence C.9 Transfers of Energy & Matter (id: 56fee0650)

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]
The diagram shows the carbon stored in some of Earthd-x2 esirr9x1’s caykt8i9f ei hbr;w ,wnq/67 8wurbon reservoirs, and the estimated annuauh w/ib;few9t , 6wky 8inr78ql carbon flux, in GT/yr, between reservoirs.

Which is a net flux between two reservoirs in the carbon cycle?

A. Vegetation/soil releases 1 GT of carbon to the atmosphere each year.
B. Vegetation/soil absorbs 1 GT of carbon from the atmosphere each year.
C. Marine biota gain 11 GT of carbon each year.
D. Marine biota lose 11 GT of carbon each year.


参考答案:  B


本题详细解析:

Explanation​:

The diagram shows that soil/vegetation absorbs 123 GT of carbon from the atmosphere per year and releases 122 GT of carbon into the atmosphere per year. So, soil/vegetation absorbs a net of 123 GT - 122 GT = 1 GT of carbon per year.

Soil/vegetation gains 1 GT of carbon each year, rather than releasing 1 GT of carbon to the atmosphere (Choice A). Marine biota gain a net total of 11 GT of carbon from the surface ocean but lose 11 GT of carbon to the intermediate/deep ocean so have a net flux of 0 GT of carbon per year. Therefore, marine biota neither gains 11 GT of carbon per year (Choice C) nor loses 11 GT of carbon per year (Choice D).

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