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]
Identify the statement kpe* n b4.;xy28sbiw *xx6 3oehqbkmnwkc:. 1that is a correcgk 9t1zbt4zt5edp3 : mazxp/3t description of a food chain.
A. The most abundant organisms in a food chain are the secondary consumers.
B. Autotrophs are producers and form the base of the food chain.
C. Energy enters a food chain via tertiary consumers.
D. The flow of energy is from secondary consumers to primary consumers to producers.
参考答案: B
本题详细解析:
Autotrophs are producers and form the .mirkllk+i*p 58 pn/u base of food chains. They carry out photosynthesis and ge/lu. +im*r8l 5p ipkknt their energy from the Sun.
The most abundant organisms (Option A) are usually the producers but there are exceptions. Energy always enters the food chain via the autotrophs, not consumers (Option C).
The flow of energy (Option D) is from producers to primary to secondary to tertiary consumers.
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