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 marine fo t0s8 :ubyps;yj/ ib0tu0cccklur8 o 6 x;k8p+o n.) 3kmsm* gmgd web
[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 producettqb2 4x h74t;vrl+hhr is 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 the phytoplankton is, therefore, at the start. It is the only organism that can h2tbtl qx 7vhrth4;+4 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.
| 
