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 followinqb t2 qn64km3nf+ad ()d7cwa bg sequences is an example of a negative feedback mechan cwad( a+bf)7dism.
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 (+ vo 1xy;gtbapa;lm0to the original, maintaining an equilibrium p;al ;(v0ay1bo tx+gmwith 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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