The diagram illustrates a sewage treatment plant. The different processes at the plant are labeled A to D.
This process results in the biological breakdown of most of the organic matter in the sewage.
1 point
1
Question 2
2.
The diagram illustrates a sewage treatment plant. The different processes at the plant are labeled A to D.
This process uses chlorine, ultraviolet radiation, or ozone as part of the disinfection of wastewater.
1 point
1
Question 3
3.
Scientists are interested in measuring the effect of pollution on the water quality of a stream. They will use observations of various bottom-dwelling insects, or macroinvertebrates, collected in the stream as indicators of the physical, chemical, and biological conditions within the stream. Which of the following best describes why macroinvertebrate sampling can be used to assess the overall health of a stream?
1 point
1
Question 4
4.
The graph shows how biological oxygen demand (BOD) and dissolved oxygen (DO) concentration change over the length of a stream. Points A–D indicate different locations within the stream.
At which of the following locations in the stream was there most likely a discharge of excess organic matter into the water?
1 point
1
Question 5
5.
The diagram shows a power plant designed to generate electricity for a nearby city.
The water used in this type of power plant is often released back into a reservoir. Which of the following effects could this released water have on the reservoir?