IB ESS Unit 2: Ecosystems & Ecology (id: 258c2d6e1)

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: an Arctic mariu;tb7ng4 ac4qr m8 8m6i ly.gane food webch 9ij nv205i5ct2g8wvqjc 2b


[File: Arctic Marine Food web.jpg - Wikimedia Commons. Example of an Arctic food web. Cmglee (2003, October). https://commons.wikimedia.org/wiki/File
.jpg Copyright free CCA by 3.0]
Draw a food chain from the food web shown in the Figure.

A. Phytoplankton ← herbivorous zooplankton ← arctic cod ← polar bear
B. Phytoplankton → herbivorous zooplankton → arctic cod → polar bear
C. Carnivorous zooplankton ← arctic cod ← harbour seal ← polar bear
D. Carnivorous zooplankton → arctic cod → harbour seal → polar bear


参考答案:  B


本题详细解析:
In a food chain, the producer np4f kv*cz:0vis at the start, and in this case, there is only one producer, the phytoplankton. Options C and D are, therefore, incorrect. Energy for the food chain comes from photosynthesis, and tz *4vvknfp 0c:he phytoplankton is, therefore, at the start. It is the only organism that can carry out photosynthesis.
In the food chain, the energy flows from the producers to the consumers, and the direction of the arrow → shows the flow of energy. The direction needs to show energy flow from producer to herbivores to consumers.

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