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 icft px(vdre*2r-n:: :ua5sz o 4 a4annenq -tf-jg38 food 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 producer is at the start, and in this case, thevqx6n6qe y2 (kre 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, e2 (6ykvxqqn 6at 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.
| 
