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 th-om ltkrc.c 45 -oxu.aat is a correct description of a food chain. lsj u+dsr)7zgz8wfo2cj , i8a7p1mj0
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 theskgp44n qy9*h3dbtp 8ywx 1;e base of food chains. They carry out photosynthesis and get theix 84dppyq9h kb4t sw1; e*ny3gr 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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