McGraw-Hill Online Learning Center Test<BLURT>

McGraw-Hill Online Learning Center Test

1. Review the animation and answer the following questions.

When biological magnification of toxic substances occurs, the most likely organisms to be adversely affected are

A. those that are at the lowest trophic level.
B. those that are at the highest trophic level.
C. primary consumers.
D. secondary consumers.

2. Bioaccumulation refers to the process A. where living organisms retain certain substances.
B. where the concentrations of toxic substances increases as we move up the food chain.
C. where the concentrations of toxic substances decreases as we move up the food chain.
D. of accumulating important nutrients during the life of an organism.

3. In the example given, where is the lowest concentration of DDT found? A. predatory birds
B. fish
C. plankton
D. marsh water

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