AP Water Pollution

As wastes are added to water, why does the pH levels drop (becoming more acidic)?

• As bacteria feeding on the wastes increase, they take in O₂ which causes more O₂ to be available to bond with the decreased H⁺ ions.

• As bacteria feeding on the wastes increases their CO₂ output; it reduces the pH.

• The “trash fish” releases ammonia into the water increasing the pH.

• Dissolved oxygen and carbon dioxide has no affect on a river’s pH.

Tags

NGSS.MS-LS2-4

NGSS.MS-PS1-2

A factory discharges a mercury-based waste into the local river. This is

• point-source pollution

• nonpoint-source pollution

• not a problem, mercury is natural

Tags

NGSS.MS-ESS3-3

Which answer choice zone would be the area that fish become stressed (lower range of tolerance) due to the pH levels?

• A

• B

• C

• D

• E

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Oxygen-depleted (hypoxia) zones of the oceans, such as the one at the mouth of the Mississippi River, are most likely caused by

• large numbers of fish that are using up all the oxygen in the water

• a reduction in the plant life in rivers that empty into the ocean near the dead zone

• excessive fertilizers carried into the ocean, which cause algal blooms that lower the oxygen levels

• thermal pollution in the ocean

Tags

NGSS.MS-ESS3-4

Why does the DO bottom out at D?

• D is where the waste entered the river

• It’s a natural occurrence since the nutrients in a river fluctuates every mile

• Bacteria feeding on the bacteria was putting O₃ back into the water

• Bacteria feeding on the wastes used up the oxygen in the water

• So that recovery could start at E

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NGSS.MS-LS1-5

Choose the zone in which the breakdown of degradable wastes by bacteria starts to deplete the dissolved oxygen.

• A

• B

• C

• D

• E

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Salt applied to roads to melt ice and snow can damage vegetation and the aquatic ecosystem. This is

• Nonpoint-source pollution

• Point-source pollution

• Salt is not a pollutant.

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NGSS.MS-ESS3-3

NGSS.MS-LS2-4

NGSS.MS-LS2-5

What is the difference between DO and BOD?

• DO is how much O₂ is present in the water whereas BOD is the number of organisms present.

• DO is how much O₂ is present in the water whereas BOD is the measure of oxygen used by organism for metabolic processes.

• As BOD decreases dissolved O₂ present in the water decreases.

• As BOD decreases dissolved CO₂ present in the water increases.

The massive and rapid algae growth that is stimulated by the addition of nitrogen and phosphorus by human activities to surface water bodies, such as a lake, is called

• cultural eutrophication

• eutrophicaton

• oligotrophic

• bioaccumulation

Tags

NGSS.MS-LS2-1

Why does the river correct itself for both pH and oxygen miles downstream?

• The bacteria ate all of the wastes

• The fish got tired of not being in sections of the river

• Rivers move fast so wastes became diluted

• There was nothing wrong with water to begin with

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4