Circle the organism that has the most DDT in its body. zooplankton or small fish
Step 11 of 3
We are being asked about which organism has more DDT. DDT is an organochlorine pesticide that is capable of entering the marine environment through water and air, as a result of its use in agriculture.
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Select the choice below that best explains which organism has most DDT in its body. A. Zooplankton has DDT. Small fish eat lots of zooplankton. Therefore DDT builds up in the bodies of the small fish. B. Large fish eat small fish, and large fish have more DDT than small fish. Therefore small fish have the most DDT.
The size distribution of zooplankton in a lake is typically a hump-shaped curve; that is, if the frequency (in percent) of zooplankton is plotted against the body length of zooplankton, a curve that first increases and then decreases results. Brooks and Dodson (1965) studied the effects of introducing a planktivorous fish in a lake. They found that the composition of zooplankton after the fish was introduced shifted to smaller individuals. In the same coordinate system, sketch the size distribution of zooplankton before and after the introduction of the planktivorous fish.