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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
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
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
13. pH should be recorded as a ____________. a. letter b. number c. parts per million d. an increase or a decrease e. percent
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
19. The test for phosphates should be run on __________ samples only. a. cloudy b. turbid c. warm d. cold e. clear
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.
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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