IB ESS Unit 2: Ecosystems & Ecology (id: 3bd5092b9)

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: A marine food wa7f/; rocm 4zn j*fuc1eb j qb (+dep /)8x* xr2/ajrkuyw



[Source: Cmglee. (2003, October). File: Arctic Food Web.svg - Wikimedia Commons. Wikimedia Commons. Retrieved April 14, 2022, from https://commons.wikimedia.org/wiki/File: Arctic_food_web.svg. Copyright under CC BY-SA 3.0]
State which organism is both a secondary and a tertiary consumer.

A. Harbour seal
B. Polar bear
C. Arctic cod
D. Capelin


参考答案:  C


本题详细解析:
Arctic cod feeds on herbivorous zooplankton which 6dhfmml9 5/wbo mm4x*is a primary consumer which makes Arctic cod a secondary consumer. Arctic cod also consumes carnivorous zooplankto4mxb f56ml9dow/* hm mn which is a secondary consumer, making Arctic cod both a tertiary and secondary consumer.
Harbour seals (Option A), polar bears (Option B) and capelins (Option D) are all tertiary consumers, not secondary consumers.

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