Holly S. Anthony
DAY 3: PESTICIDES (WORKSHEET SHOWING THE CONCENTRATION OF PESTICIDES FOUND IN THE CELLS OF LIVING THINGS IN AN ECOSYSTEM)
Worksheet: For years pesticides have been used to control or kill pests. Unfortunately, many pesticides remain in the environment for years after being applied, contaminating not only the environment of the area, but also the organisms living there. Table 1 shows the concentrations of pesticides found in the cells of living things in an ecoystem. Questions relating to the Table follow.
Table 1
|
Organism
|
Pesticide concentration
|
(parts per million)
|
Blue-green algae
|
0.0001
|
|
Water crustaceans
|
0.001
|
|
Small fish
|
0.01
|
|
Trout
|
0.1
|
|
Polar bears
|
?
|
Each of the organisms listed above is part of a naturally occurring food chain. Figure 1 shows this food chain.
blue-green algae ——> water crustaceans ——> small fish ——> trout —> polar bears
