Holly S. Anthony
Questions:
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1. What can one conclude about the concentration of pesticides in the organisms as one moves up the food chain?
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a. Pesticide concentration decreases.
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b. Pesticide concentration remains fairly constant.
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c. Pesticide concentration increases about ten times between each link.
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d. Pesticide concentration initially increases but then decreases.
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2. If the pattern of change in the concentration of the pesticide seen in earlier links continues, what would most likely be the concentration of the pesticide in polar bears?
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a. 0.01 ppm
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b. 0.1 ppm
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c. 1.0 ppm
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d. 10.0 ppm
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3. Which organism serves as the primary producer in the food chain shown in Figure 1?
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a. Blue-green algae
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b. Water crustaceans
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c. Small fish
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d. Trout
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4. Some pesticides are not as effective against insects as they were in the past. Which of the following best explains why this is true?
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a. The pesticides killed off the insects food supply in the past.
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b. The pesticides were used in lower concentrations in the past.
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c. Individual insects became tolerant to the pesticides and survived.
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d. Some of the insects were tolerant to the pesticide and survived to produce offspring.
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5. Suppose the small fish population was killed off by the pesticides. Describe what would happen to the rest of the organisms in the food chain shown in Figure 1. Explain your answer fully.
