本题目来源于试卷: IB ESS Unit 2: Ecosystems & Ecology，类别为 IB环境系统与社会
[单选题]
Figure: Population densities of a predator a g s1 )if1/o*4nkgytn0ayeck/e,+ za h7 wdc4xnd its p csw 84kr 9jse7rey
[Source: Adapted from Hczam (March 2020) File: predator prey.jpg - wikimedia commons A generalized graph of a predator-prey population density cycle. Retrieved June 18,2023 from https ://commons.wikimedia.org/wiki/File: Predator_prey_curve.png Copyright under CC0 4.0]
The Figure shows the population density cycles of a predator and prey. Describe the relationship between the two animals.
A. No relationship between predator and prey
B. Negative feedback maintaining a stable equilibrium
C. Positive feedback maintaining a stable equilibrium
D. Positive feedback going away from the initial equilibrium
参考答案: B
本题详细解析:
Negative feedback is when an initial change to a system leads to a rubffkot+ 1k 6y -+q4ccesponse that reduces that change and brings the system back to the original state. Negative feedback is important in maintainkb+uc4-16 oytkfqc f+ing a stable equilibrium.
Option A is incorrect as there is clearly a relationship between predator and prey, as we can see that when one goes up or down the other does so too.
Positive feedback does not bring the system back to equilibrium, but takes it away from the initial equilibrium, sometimes to a tipping point. Options C and D are therefore incorrect.
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