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: Ecological pyramid of 2cdf :bf*lf0t -ozb 6a nu *2r1 a g0eg+*ianb lovmbers
Determine the food chain that might be represented by this pyramid.
A. phytoplankton − − zooplankton − − shrimp − − codfish
B. grass − − rabbits − − foxes − − bear
C. tree − − caterpillars − − songbirds − − hawk
D. blueberry bushes − − aphids − − spiders − − frogs
参考答案: C
本题详细解析:
In a pyramid of numbers the first level (producers) is represented as a much smaller portion (number), so it most likely represents a tree. The second trophic level represents primary consumers. Option C is the only possible correct solution because the producers in options A, B, and D would all have larger numbers, energy, or biomass than their primary consumers, thus not fitting the pyramid structure shown in the figure.
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