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 statements that describe the use of dj/2p)pu73yzwk wz9v DDTfba chgn q0bck: ma:..a 21sqo+1 l4xn as an insecticide.
I. Certain chemicals tend to concentrate in higher trophic levels of the food chain.
II. DDT is a chemical that can be added to water bodies to control mosquito larvae.
III. Populations most affected by DDT due to biomagnification were fish and birds; therefore, this chemical has been banned in some countries.
A. I, II and III
B. I and III only
C. I and II only
D. III only
参考答案: A
本题详细解析:
All the statements show how DDT, when added to water bodies, can be transfer3f,; t3)d:pib wdja5m a kx7mi31mkkfred to the top carnivores in an ecosystem. It is concentrated in the tissues of organisms along the transfer, and this process is called biomagnificationa;km imk5px3wibkmda dj 7f13ft:) 3,.
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