Select the best response to the questions below.

For a printable version of this pre-test, click here.

1. Decreasing the temperature of the water will increase the _______________.

A. amount of oxygen dissolved in the water
B. rate of growth of organisms in the water
C. rate of photosynthesis of plants in the water
D. incidence of disease in the organisms in the water
E. level of toxicants in the water.

2. An inverse relationship is best described as an association of factors where:

A. an increase in one factor causes an increase in another factor.
B. an increase in one factor causes a decrease in another factor.
C. a decrease in one factor causes a decrease in another factor.
D. changes in one factor does not change another factor.
E. changes in one factor have a variety of possible effects on another factor.

3. Adding ___________to water will increase the amount of dissolved oxygen.

A. plants
B. heat
C. fish
D. bacteria
E. sunlight

4. In general, most aquatic organisms ________________________________.

A. are adapted to live in a broad range of temperatures.
B. are unaffected by changes in temperature.
C. survive within a narrow range of temperatures.
D. are intolerant in any variation of temperature.
E. are not dependent upon temperature.

5. Which of the following would increase the temperature of a river?

A. planting trees along the banks
B. increasing the surface runoff into the river
C. decreasing the amount of waste water from a nearby electrical plant that enters the river
D. preventing erosion of the soil along the banks of the river
E. increasing the number of fish in the river

6. Which of the following factors has little effect on the temperature of a river?

A. source of the water for the river
B. type of soil of the area through which the river passes
C. type and number of organisms living in the river
D. number and type of trees along the banks of the river
E. geographic location of the river

7. In general, fish that live in colder waters most likely have a _______________than fish that live in warmer water.

A. larger size
B. shorter life
C. greater amount of oxygen available
D. greater amount of illness and disease
E. greater impact on the temperature of the waters in which they live

8. Which of the following things are often increased in rivers by wetlands?

A. bacteria
B. toxicants
C. lead
D. oxygen
E. pollutants


9. Which of the charts below best represents the relationship between water temperature and dissolved oxygen? (Please see printable version to view the charts)

A. Chart 1
B. Chart 2
C. Chart 3
D. Chart 4
E. None of these

10. Which of the following charts best represents the relationship between the area of wetlands and the amount of dissolved oxygen present in a river fed by these wetlands? (Please see printable version to view the charts)

A. Chart 1
B. Chart 2
C. Chart 3
D. Chart 4
E. None of these

11. If the temperature is 32F, what is the temperature in C?

A. - 32
B. 0o
C. 1.8

D. 32

E. 90

12. You are serving as a research scientist with the Environmental Protection Agency. You are monitoring the temperature of rivers in an area. Because of poor management in the past, five of the major rivers in your area were in danger. Your team designed and executed five different projects (one per river) in an attempt to determine which one method was best at lowering the temperatures of the overheated rivers. You compared current information with temperatures from the same time last year. The results are summarized in the table below. Of the five different measures you took, which river benefited most from the actions you took?

River Treatment Last year's Temp (C) This year's temp (C)
Apple Plant trees along the banks 17C 16.5C
Big Plant vines along the banks to prevent erosion 18C 14C
Chattanooga Add aquatic plants to the river 16C 16C
Durham Limit dumping of wastewater from an electric plant 13C 10C
East Dam the river to limit its flooding 16C 18C


A. The Apple
B. The Big
C. The Chattanooga
D. The Durham
E. The East


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