IB ESS Unit 2: Ecosystems & Ecology (id: 770054117)

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]
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[Created with BioRender.com]
The figure shows a rice cultivation system that eliminates the need for fertilizers, herbicides and pesticides by using ducks in the organic cultivation of rice. In addition, Azolla, an aquatic floating fern, is grown on these fields because it harbours blue-green algae which can fix atmospheric nitrogen. Using this system, rice, ducks, and fish can all be produced for human consumption in one location.
Which option includes two of the autotrophs in the system?

A. Azolla and rice
B. Azolla and ducks
C. Rice and fish
D. Fish and ducks


参考答案:  A


本题详细解析:
Ducks and fish are consumers (Options B, C and D), which is a type of heterotqvvh+l*fdi .numkp+*p lk6(6roph, whereas Azolla and rice can carry out photosynthesis and are, therefore* kh++uplvp6.dnl vq(km6i* f, autotrophs (self-feeding).

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