For a printable
version of the Pre-Test, click
Select the best
response to the questions below.
1. Which of
the following is true concerning dissolved oxygen and fish?
A. Fish do not use oxygen
so the amount of oxygen dissolved in water does not matter.
B. Fish remove oxygen from the atmosphere by coming to the surface
and swallowing bubbles.
C. Fish remove oxygen from the water by using their gills.
D. The scales of fish have a vast blood supply and they remove oxygen
dissolved in the water.
E. Fish can breathe with lungs when they need to.
2. The amount of oxygen dissolved in water is ______________the
temperature of the water.
A. directly related to
B. inversely related to
C. exactly the same as
D. not influenced by
E. parallel to
3. What percentage
of the atmosphere is oxygen?
4. When oxygen moves
with respect to water, it mainly moves ______________________________________.
A. by diffusion from
the air to the water, as air has a higher concentration of oxygen.
B. from the water to the air as large amounts of oxygen are produced
by aquatic plants.
C. from air to water, as aquatic plants pull the oxygen from the
D. from the water to the air, as the temperature of water is more
stable than the temperature of air.
E. from the water to the air, as water is more turbulent than the
5. You measure and
determine the average amount of dissolved oxygen in five bodies
of water over a year. Which one of the following would have the
highest average dissolved oxygen?
A. a mountain lake with
numerous, aquatic plants
B. a rapid flowing stream at the base of a mountain
C. a slow moving river in West Texas
D. a stagnant pond in East Texas
E. an underground river (aquifer)
6. You are investigating
the die-off of numerous fish in a river that passes near a fertilizer
plant. You are concerned that the plant may be dumping nitrates
into the river. If you wanted to measure dissolved oxygen in the
river when it was at its lowest, what time of day would be best
to sample the water?
A. 5:00 a.m.
B. 10:00 a.m.
C. 2:00 p.m.
D. 5:00 p.m.
E. 10:00 p.m.
7. Which of the following
does not increase the amount of dissolved oxygen in water?
A. diffusion from the
B. bacteria in the water
C. plants in the water
D. rapid movement of water over rocks
E. algae in the water
8. The amount of oxygen
dissolved in water is measured as________ and is the same thing
A. mg/L; parts per billion
B. mg/L; parts per million
C. ounces/quart; parts per thousand
D. ounces/gallon; parts per million
E. mg/L; parts per thousand
9. As the altitude
increases, assuming constant water temperature, the amount of oxygen
dissolved in water ______________________.
A. stays the same
B. becomes unstable
C. increases, then stabilizes
10. Dams can affect
the amount of oxygen dissolved in water by all but which of the
A. slowing the flow of
B. decreasing aeration of water
C. increasing the temperature of water
D. increasing the amount of bacteria in water
11. One problem that
occurs when raw sewage enters rivers and streams is _____________________________________________.
A. the bacteria present
consume large amounts of dissolved oxygen.
B. the bacteria present produce toxins that can kill fish.
C. the bacteria present produce toxins that can kill aquatic plants.
D. the sewage acts as fertilizer and causes plants to grow too fast.
E. chemicals used to treat raw sewage will kill both fish and aquatic
12. You are serving
as a research scientist with the Environmental Protection Agency.
You are monitoring the dissolved oxygen of rivers in an area. You
record the amount of oxygen dissolved in the Apple River near the
Apple Sewage Treatment Plant to average 7 mg/dL. The amount of oxygen
dissolved of the Big River near the Big River Golf Course averages
6.5 mg/dL. Additionally, measurements of dissolved oxygen from the
Chattanooga River average 8.5 mg /dL near the Chattanooga Dam and
Electric Plant. The Durham River has an average dissolved oxygen
of 4 mg/dL near the Durham Fertilizer Plant, and the East River,
near the East River Sawmill has an average dissolved oxygen of 8
mg/dL. Of the five riverside industries, which is most likely ignoring
guidelines on maintaining water quality?
A. The Apple Sewage Treatment
B. The Big River Golf Course
C. The Chattanooga Dam and Electric Plant
D. The Durham Fertilizer Plant
E. The East River Sawmill