Water Quality Review Question Preview (ID: 34058)


Predict The Safety And Potability Of Water Supplies In North Carolina Based On Physical And Biological Factors, Including:. TEACHERS: click here for quick copy question ID numbers.

What initially happens to the water quality in a lake when there is an increase in nitrates?
a) The dissolved oxygen levels will increase.
b) The pH will remain neutral.
c) The temperature will increase.
d) The turbidity will decrease.

Which conditions indicate that a water system is healthy?
a) high dissolved oxygen, low temperature, and high nitrates
b) low dissolved oxygen, high temperature, and low nitrates
c) low temperature, low dissolved oxygen, and high numbers of bioindicators
d) high numbers of bioindicators, low temperature, and high dissolved oxygen

Why do high nutrient levels reduce water quality for fish and other organisms?
a) Higher nutrients can increase turbidity.
b) Higher nutrients can increase pH.
c) Higher nutrients can increase dissolved oxygen.
d) Higher nutrients can decrease water temperature.

When an algal bloom occurs, what happens to other organisms living in that part of the water?
a) They experience an increase in population size.
b) They find food a variety of food sources more easily.
c) They experience stress due to a decrease in dissolved oxygen levels.
d) They thrive due to an increase in sunlight.

What effect do waves in a river have on water quality?
a) a decrease in algae
b) a decrease in sediment
c) an increase in dissolved oxygen
d) an increase in industrial pollution

What happens to water in the river when excess nutrients from the farmland enter the river?
a) The nutrients provide energy to aquatic organisms.
b) The nutrients may cause an algal bloom, lowering the dissolved oxygen in the river.
c) The nutrients dissolve in the water because of the high turbidity of river water.
d) The water will have a lower turbidity and become stagnant.

Dissolved oxygen levels in water sources are dependent on several factors, including temperature and concentration of plant and animal species. Which environment would most likely have the highest levels of dissolved oxygen?
a) a warm environment in which aquatic animal populations are high, and plant growth is low
b) a warm environment in which aquatic animal populations are low, and plant growth is high
c) a cool environment in which aquatic animal populations are high, and plant growth is low
d) a cool environment in which aquatic animal populations are low, and plant growth is high

Which example represents a non-point source of pollution?
a) chlorine released from a chemical company
b) chemical runoff from lawns
c) oil released from a leaking underground pump
d) wastewater leaking from a pipe

Which example represents a point source of pollution?
a) acid rain caused by exhaust from vehicles
b) chemical runoff from lawns
c) oil and gasoline discharged from cars
d) heated water released from a power plant

What is the main purpose for adding chlorine during the water treatment process?
a) It improves the taste and odor of treated water.
b) It kills disease-causing bacteria and microorganisms.
c) It keeps the pH of treated water within an acceptable range.
d) It removes traces of harmful metals such as lead.

What is the best method for the preservation of water quality?
a) Water treatment plants should increase the use of chemicals to cleanse water.
b) Local and government organizations should monitor and assess lakes and streams.
c) Humans should cease all recreational and agricultural uses of water resources.
d) Humans should toilet, launder, and bathe in rivers and streams to avoid utilizing tap water.

What is the primary difference between the treatment processes for drinking water compared to wastewater?
a) Only drinking water goes through a sedimentation process
b) Wastewater treatment begins with water from lakes, rivers, or groundwater.
c) Once treated, wastewater is released into a waterway.
d) Treatment of drinking water does not involve the addition of chemicals.

If all pollution must be caused by a source, how is it possible to have non-point source pollution?
a) The pollution is transferred from place to place by water or air.
b) There is only one source of the pollution that can be identified.
c) The source cannot be identified or comes from many different unknown sites.
d) The source of the pollution is not located in the same area as the polluted site.

Which best describes a bioindicator?
a) a species that has a short life span.
b) a species that depends on specific conditions to survive.
c) a species that can adapt to a variety of conditions.
d) a species that has been introduced to an ecosystem.

Why is filtration an important part of water treatment?
a) Filtration guarantees a clear coloring in water.
b) Filtration removes small particles from the water.
c) Filtration adds chlorine to water to kill microorganisms.
d) Filtration adds vitamins and minerals to drinking water.

Which source of water pollution includes oil and gasoline discharge from automobiles and storm sewer drainage?
a) agriculture
b) bacteria
c) sedimentation
d) urban runoff

What is the relationship between dissolved oxygen and temperature?
a) high temperature=low oxygen level
b) high temperature=high oxygen level
c) low temperature=low oxygen level
d) temperature and oxygen levels have no relationship

What is one way scientists analyze the health of a river?
a) by measuring its depth.
b) by measuring the speed at which the river flows.
c) by measuring its dissolved oxygen content.
d) by measuring the distance the river travels to reach an ocean.

A landfill is most likely to directly pollute
a) water vapor over the landfill
b) precipitation about to fall on the landfill
c) surface streams flowing to the landfill
d) ground water under the landfill

Which of the following best represents the relationship between dissolved oxygen levels and the mortality(death) rate of aquatic organisms?
a) As DO levels increase, mortality rates decrease
b) As DO levels increase, mortality rates increase
c) As DO levels and mortality rates remain constant and do not change
d) There is no relationship between DO levels and mortality rate

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