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Water Pollution pretest

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sorry I couldn’t add more. I passed the pretest.

Here’s what i got. it gave me 100%.

Which of the following factors determines how harmful an introduced chemical will be on the environment?
a.
type of chemical
b.
concentration
c.
weather conditions
d.
all of the above

d. all of the above

Nonpoint source pollution is difficult to control because it _______.
a.
comes from a direct point of origin
b.
comes from a variety of sources
c.
remains the same over time
d.
none of the above

b. comes from a variety of sources

The principle difference between point source and nonpoint source water pollution is _______.
a.
whether the pollution is organic or inorganic
b.
the number of sources of pollution
c.
the amount of pollution
d.
whether it is from commercial or agricultural sources

b. the number of sources of pollution

Point source pollution is much more difficult to track and clean up than nonpoint source pollution.

F. false

Which of the following best describes the effects of water pollution on aquatic ecosystems?
a.
It can result in fish kills and restrictions on human consumption.
b.
It can change the physiology of fish.
c.
It can cause long-term alterations of aquatic ecosystems.
d.
All of the above

d. All of the above

Changing your toilet can reduce water pollution because _______.
a.
the sewage is partially treated in the toilet before entering the sewer system
b.
chemicals added by new toilets neutralize the pathogens in the water
c.
more efficient plumbing uses more water and creates larger volumes of waste
d.
more efficient plumbing uses less water and creates smaller volumes of waste

d. more efficient plumbing uses less water and creates smaller volumes of waste

How does de-icing roads with salt negatively impact the environment?
a.
The road salt attracts deer that are then hit by motor vehicles.
b.
It removes necessary salt from the local water courses.
c.
The high salinity of the surface runoff is harmful to freshwater ecosystems.
d.
The salt harbors salt eating bacteria that are toxic to animals.

c. The high salinity of the surface runoff is harmful to freshwater ecosystems.

Which of the following is true concerning sources of water pollution?
a.
Mine wastes and heavy metals become water pollution through storm water runoff.
b.
Biodegradable materials like food, wood, and leaves are not considered pollution.
c.
Petroleum byproducts and fuels end up as pollution principally from oil spills.
d.
Pesticides and herbicides do not commonly become water pollutants.

a. Mine wastes and heavy metals become water pollution through storm water runoff.

Which of the following is the most serious effect of water pollution for humans?
a.
infectious diseases
b.
algal blooms
c.
toxic food chain effects
d.
low-oxygen water

a. infectious diseases

Introduced sewage in water systems _______.
a.
decreases levels of phosphorus and nitrogen
b.
increases oxygen levels
c.
increases concentrations of solids
d.
leads to decreases in the temperature

c. increases concentrations of solids

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