本题目来源于试卷: IB ESS Unit 1 Foundations of ESS，类别为 IB环境系统与社会
[单选题]
ldentify which of the following optionn fucv+4z df/.57 fkxls k)w sv xu3fc)5about feedback is not correctly paired with thk)w ufxv5s) 3ce example?
what is Feedback cycles; Example?
A. Positive feedback cycle; Forest fires will decrease the carbon sinks of the forests, will release more carbon dioxide into the atmosphere and therefore increase warming, and could cause more fires.
B. Negative feedback cycle; Increased temperature will increase cloud cover, and cause decreased temperature , will decrease cloud cover.
C. Negative feedback cycle; Population growth will increase birth rate and continual growth of population.
D. Positive feedback cycle; Permafrost melting causes release of methane which adds to warming and further melting of permafrost.
参考答案: C
本题详细解析:
Negative feedback cycle will prevent an exponential incr0jgsi/v3r sxo:n8b(p ease in population numbers like in the predator prey cycle. Increased cloud coop/j083xsgibs nv(r:ver (Option B) will decrease temperature, which will eventually decrease cloud cover and increase temperatures. Negative feedback will negate the change and bring the system back to its original equilibrium.
Positive feedback cycles (Options A and D) take the system away from the equilibrium, and amplifies the change.
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