Water Quality Question Preview (ID: 37502)


8th Grade Water Quality Review. TEACHERS: click here for quick copy question ID numbers.

Which of the following indicate that a water source is healthy?
a) high nitrates, high pH, and low temperature
b) low pH, low dissolved oxygen, and high nitrates
c) high turbidity, high dissolved oxygen, and high temperature
d) low temperature, high dissolved oxygen, and neutral pH

Scientists test the Cape Fear River in August, and the dissolved oxygen levels are low. What is the most likely reason for this?
a) low turbidity
b) high salinity
c) high temperatures
d) high pH

In which conditions are fish most likely to die in a lake?
a) when the water's turbidity is low and temperatures are in the average range
b) when the water's dissolved oxygen is low and the temperatures are higher than average
c) when the water's dissolved oxygen is high and the pH is neutral
d) right after a storm with heavy rainfall

Which pH levels are the best for marine organisms?
a) 1.0
b) 3.0
c) 8.0
d) 11.0

Turbidity is
a) how much hydrogen is available in the water
b) how much oxygen is dissolved in the water column
c) the amount of algae in the water
d) how cloudy or clear the water is.

Fish need dissolved oxygen levels over
a) 1
b) 3
c) 5
d) 10

0-6 on the pH scale is considered
a) acidic
b) basic
c) neutral
d)

8-14 in the pH scale is considered
a) acidic
b) basic
c) neutral
d)

7 on the pH scale is considered
a) acidic
b) basic
c) neutral
d)

Bioindicators are
a) the number of fish living in a water source
b) organisms used to monitor the health of an ecosystem
c) plants that survive or die in an ecosystem
d) temperature, pH, and turbidity measures of a water source

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