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Water Quality Pretest


Read each of the following questions carefully. Choose the response which best answers the question. Choose only one response for each question.

Dissolved Oxygen

1. The lowest range of dissolved oxygen levels which will support a diverse population of organisms is ____________.
a. 1-2 ppm
b. 3-4 ppm
c. 5-6 ppm
d. 7-8 ppm
e. 9-10 ppm

2. Which of the following organisms would be found in an aquatic
ecosystem if the dissolved oxygen levels were low?
a. mayfly nymph
b. stonefly nymph
c. caddisfly larvae
d. beetle larvae
e. blackfly larvae

3. Which of the following would not affect the dissolved oxygen levels of an
aquatic ecosystem?
a. the number of times a reading is taken.
b. time of day
c. weather
d. how the sample is collected
e. temperature

4. A decrease in dissolved oxygen levels is usually an indication of an
increase in this type of pollution.
a. inorganic
b. organic
c. petroleum-based
d. sulfur-based
e. insoluble

LaMotte Dissolved Oxygen Test Kit

5. The sampling bottle should be rinsed with ___________ before adding
the water sample.
a. distilled water
b. tap water
c. should not be rinsed
d. a dilute HCl solution
e. the water sample to be tested

6. Air bubbles should be removed after filling the bottle with the water
sample to be tested before replacing the top by ______________.
a. tapping the sides of the bottle
b. inverting the bottle
c. they do not need to be removed
d. they are removed when the top is put on the bottle
e. emptying and refilling the bottle several times

7. The level of dissolved oxygen is recorded as ____________.
a. a percent
b. an average
c. milliliters
d. parts per million
e. grams

pH

8. A pH value is an assigned number which is based on a scale which
ranges from _______________.
a. 0-6
b. 0-7
c. 0-14
d. 7-14
e. 8-14

9. A pH of 7 is ____________.
a. natural
b. acid
c. base
d. neutral
e. alkaline

10. A pH of 2 is ____________ times more acidic than a pH of 4.
a. 1
b. 2
c. 10
d. 100
e. approximately the same.

11. In the United States, the pH of natural water systems normally fall within
the following range:
a. 1-7
b. 1-3
c. 4.5-5.5
d. 6.5-8.5
e. 10-14

LaMotte pH Test Kit

12. To test the pH, fill the test tube with _________ milliliters of the water
sample to be tested.
a. 2
b. 5
c. 6
d. 8
e. 10

13. pH should be recorded as a ____________.
a. letter
b. number
c. parts per million
d. an increase or a decrease
e. percent

Nitrates and Phosphates

14. Bacteria break down large protein molecules into ____________which combine with oxygen to form nitrates and nitrites.
a. ammonia molecules
b. metals
c. pathogens
d. alcohols
e. preservatives

15. Which of the following is not a possible sources of nitrates in an aquatic
ecosystem?
a. decomposing plant material
b. improperly installed septic systems
c. fertilizer runoff
d. dissolved oxygen
e. improperly treated wastewater

16. Which of the following is a phenomenon which occurs in an aquatic
ecosystem after the introduction of excessive phosphates?
a. algal blooms
b. increase in numbers of macroinvertebrates
c. increase in dissolved oxygen levels
d. the water is safe to drink
e. an increase in the number of fish species.

17. Which of the following products was once a major source of phosphates
in aquatic ecosystems?
a. deodorants
b. detergents
c. sodas
d. body lotions
e. hair sprays

LaMotte Nitrate-N and Phosphate Test Kit

18. To change the reading from Nitrate-N to Nitrate, the number read from
the Axial Reader is multiplied by ________.
a. 2.2
b. 4.4
c. 6.2
d. 8.4
e. 10

19. The test for phosphates should be run on __________ samples only.
a. cloudy
b. turbid
c. warm
d. cold
e. clear

Macroinvertebrates

20. If a macroinvertebrate survey contains primarily leeches and aquatic worms, what water conditions would prevail?
a. high dissolved oxygen levels, good water quality
b. low dissolved oxygen levels, good water quality
c. low dissolved oxygen levels, poor water quality
d. high in dissolved oxygen levels, poor water quality
e. cannot determine from data given

21. If a macroinvertebrate survey contains primarily stoneflies and mayflies, what water conditions would prevail?
a. high dissolved oxygen levels, good water quality
b. low dissolved oxygen levels, good water quality
c. low dissolved oxygen levels, poor water quality
d. high dissolved oxygen levels, poor water quality
e. cannot determine from data given

22. If the primary macroinvertebrate counted in a survey is a blackfly larva, what water conditions would prevail?
a. high dissolved oxygen levels, good water quality
b. low dissolved oxygen levels, good water quality
c. low dissolved oxygen levels, poor water quality
d. high dissolved oxygen levels, poor water quality
e. cannot determine from data given

23. If a macroinvertebrate survey contains primarily stoneflies, mayflies, and a few leeches, what water conditions would prevail?
a. high dissolved oxygen levels, good water quality
b. low dissolved oxygen levels, good water quality
c. low dissolved oxygen levels, poor water quality
d. high dissolved oxygen levels, poor water quality
e. cannot determine from data given

24. If a macroinvertebrate survey contains primarily leeches, what water conditions would prevail? .
a. high dissolved oxygen levels, good water quality
b. low dissolved oxygen levels, good water quality
c. low dissolved oxygen levels, poor water quality
d. high dissolved oxygen levels, poor water quality
e. cannot determine from data given

25. Aquatic worms are normally found in ______________________________.
a. good quality water and are pollution intolerant.
b. good quality water and are pollution tolerant.
c. poor quality water and are pollution intolerant.
d. poor quality water and are pollution tolerant.
e. None of the above.

26. Stoneflies and mayflies are normally found in _________________________.
a. good quality water and are pollution intolerant.
b. good quality water and are pollution tolerant.
c. poor quality water and are pollution intolerant.
d. poor quality water and are pollution tolerant.
e. None of the above.

Temperature

27. Which of the following is not influenced by the temperature of an aquatic ecosystem?
a. dissolved oxygen levels
b. the rate at which photosynthesis takes place
c. the metabolic rate of aquatic organisms
d. how organisms are affected by pollutants, parasites and pathogens
e. pH

28. Which of the following water samples would have the highest dissolved oxygen levels?
a. a water sample collected on a winter day (temperature is 35 degrees F)
b. a water sample collected and left sitting in the sun for two hours and then tested.
c. a water sample which was heated and then tested
d. a water sample collected on a summer day (temperature is 82 degrees F)
e. a turbid water sample

29. As the temperature increases, the rate of photosynthesis _______________.
a. decreases
b. increases up to temperatures of 32 degrees Celsius.
c. stops
d. stays the same
e. decreases and then stops

30. As the temperature increases, the metabolic rate of aquatic organisms ______________.
a. decreases
b. stops
c. increases
d. stays the same
e. decreases and then stops

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