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 d 6ae n5;f0rem qarv9x3escriu,7mc fdq1i oq5j+ ;nkbe the use of DDT 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 wrnvmdj.y ecw )2 ta7s3k0c09iater bodies, can be transferred to the top carnivores in an ecosystem. It is concentrated in the tissues of organisms along the transfer, andwtvm jnec.ik 209c70a yd3s r) this process is called biomagnification.
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