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]
Determine which of the following sequenchsk jntmc7*+ahv 8 q9 x1n(cp5es is an example of a znk+y+z0hllg;en8*b negative feedback mech z+lk8ehnn0l+g*;ybzanism.
A. Deforestation → → fewer trees → → more run off → → less infiltration into soil → → less water for trees → → fewer trees
B. Increase in temperature → → increase in cloud cover → → decrease in temperature → → decrease in cloud cover → → increase in temperature
C. Increase in primary production → → increase in falling leaves → → increase in soil organic matter → → increase in soil nutrients → → increase in primary production
D. Thawing of permafrost → → bacteria break down organic matter → → release of methane into atmosphere → → increase in temperature → → thawing of permafrost
参考答案: B
本题详细解析:
Negative feedback loops will negate the change and bring the system back to ape y3l9+0xi )w9n vffthe original, maintaining an equ lyf+39)9xnfe0iapv wilibrium with small fluctuations.
Positive feedback loops will destabilize the system and amplify the changes as shown in options A, C and D.
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