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 sequences is an ,ib*g963 k jxjeo:zmgexay n2,vjoh ;d-pmple of a negative feedback mhd-v 2jn,py;oechanism.
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 negats i jxph.nhi.))p +w-x y(krbbmot;(6e the change and bring the system back to the original, maintaining an equilibrium with small fluco)ry;np- x( .xbiihjbm)h(psk.6w t+tuations.
Positive feedback loops will destabilize the system and amplify the changes as shown in options A, C and D.
| 
