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 food w - )zxp rvw( :*ij/fntpeb u4ptt a(9nj1*t r.fgx
[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 s.)d mp hs,e3vptart, and in this case, there is only one producer, the phytoplankton. Options C and D are, therefore, hsp 3d,pe)vm.incorrect. Energy for the food chain comes from photosynthesis, and the 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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