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 t3gl,a w2-bk x0xvpk u4iv(s3uhe following sequences is an example of a negazfw6 .o 3y,fntxingk: 9fu:0 ck1 h0kutive feedback mechan6uyz:uwk .3niof 1gf0 f ,0tk:ch9 knxism.
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 wit) p r age1xune85k60kll negate the change and bring the system back to the original, maintaining an equilibrium with small fl u5p8)re6ka0gek 1xt nuctuations.
Positive feedback loops will destabilize the system and amplify the changes as shown in options A, C and D.
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