1. What is the chemical name for DDT?
2. What decade was DDT developed?
3. What was the purpose of DDT?
4. What were some of the ecological issues that were found to be caused by DDT?
The following food chain rep
...
1. What is the chemical name for DDT?
2. What decade was DDT developed?
3. What was the purpose of DDT?
4. What were some of the ecological issues that were found to be caused by DDT?
The following food chain represents the flow of energy in the pond ecosystem.
5. Suppose that a minnow eats 100 marsh plants in one year. How much DDT builds up in the body of the minnow? Write that number below the minnow in the food chain. 100
6. A perch eats 50 minnows in one year. How much DDT accumulates in the perch’s body? Write that number below the perch in the food chain.
50,000
7. The red-tailed hawk consumes 20 perch in one year. What amount of the pesticide builds up in this consumer. Write this number below the red-tailed hawk in the food chain.
8. Draw (use your drawing tool & insert below) a pyramid to represent the number of organisms and the amount of energy in each trophic level of the food chain. (1 unit of food is 10kcal).
9. Draw (use your drawing tool & insert below) a pyramid to represents the ppm of DDT in each trophic level of the food chain. Keep the marsh plants at the bottom of the pyramid.
Analysis:
10. How does the DDT originally enter the food chain?
11. Which organisms had the most DDT in their bodies?
12. At what trophic level would you expect to find these organisms?
13. What is the relationship between the trophic level and the amount of DDT found in the body of these organisms?
They both have to do with percentages and start with 10%
14. Define biomagnification.
15. Give an example of how an animal that lives kilometers away from a region, which was sprayed with DDT, could have DDT in their bodies.
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