6.4b Pollution in the Food Chain

Multiple Choice

How does biological pollution affect water quality?

• It improves water quality

• It has no effect on water quality

• It causes contamination of drinking water

• It makes water safe for consumption

Multiple Choice

What are persistent organic pollutants (POPs) and why are they called that?

• They break down easily in the environment

• They take a long time to break down

• They are beneficial for the environment

• They are found only in water

Multiple Choice

The graph shows mercury levels found in prey, sediments, and shorebirds. Which of the following is an inference of the data shown in the graph?

• mercury levels are elevated by the presence of shorebirds

  
  

• mercury concentrations increase at higher trophic levels

• mercury is produced by sediments
• mercury assures the survival of prey animals

Multiple Choice

What does LD50 stand for in the context of bioassays?

• Lethal Dose 50

• Low Dose 50

• Lethal Drug 50

• Low Drug 50

Multiple Choice

What is the purpose of a bioassay?

• To determine the effect of a chemical on a living organism

• To test the effectiveness of a new drug

• To measure the population of an organism

• To analyze the genetic makeup of an organism