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]
Identify the graph that best uwge/pv smq+e+u7 (w 1reflects the growth of a x3q6fpb(x+3 )j rw gus population over time.
A.
B.
C.
D.
参考答案: B
本题详细解析:
Option B shows continuous fluctuations in population number9q0 *l0m jwtb ,ka39e5vmer ej1k wp/ts due to random occurrences in the environment at all stages. Once the population hits the environment's carryi t/e9m9le0ja, rpkwq0 vtj ke35 b*1wmng capacity for that species, population growth will slow down and collapse to below carrying capacity before growing again. Population size continues to fluctuate around the carrying capacity.
Option A is a theoretical model that shows exponential growth that slows down due to limiting factors as the population size approaches and then reaches the carrying capacity. Real life is not this simple, but the model helps us understand what influences population growth.
Option C shows the population eventually settling at the carrying capacity. In reality, the fluctuations will continue.
Option D does not show a normal sequence of events. Usually, the ‘dieback' occurs only when the population exceeds carrying capacity, not as shown here.
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