Oxygen Sag Curve

Which of the following would be considered water pollution from a non-point source?

• chemical from a factory entering a stream through a drain pipe

• sewage leaking into a lake from a treatment plant

• agricultural pesticides leaded into ground water from a storage area

• residential and industrial runoff contributing to poor water quality

In a flowing stream, the breakdown of degradable wastes by bacteria deplete DO and creates an

• oxygen sag curve

• oxygen spike curve

• oxygen rich atmosphere

• increase in biodiversity

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

The oxygen sag curve shows a drop in

• low oxygen demand organisms

• high oxygen demand organisms

• oxygen demand

• dissolved oxygen

Tags

NGSS.MS-LS2-4

In which of the following zones would you expect fish to be absent?

• clean zone

• decomposition zone

• septic zone

• recovery zone

In which of the following zones would you expect to find trashy fish like carp, gar and leeches?

• clean zone

• decomposition zone

• septic zone

• recovery zone

Tags

NGSS.MS-LS2-4

Parts of a river associated with a point-source pollutant are shown below. Which of the combinations is incorrectly paired?

• clean zone - high levels of dissolved oxygen

• decomposition zone - only pollution-tolerant fishes found

• septic zone - most fish absent, low levels of DO

• recovery zone -normal levels of DO and high levels of BOD

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Dissolved oxygen content will ___ as pollution increases.

• increase

• decrease

• stay the same

• fluctuate

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

The release of a large amount of sewage and other organic wastes into a river would likely result in a sharp

• increase the BOD

• increase the amount of DO

• decrease the bacteria counts

• decrease the temperature of the river water

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

An abundance of which of the following would indicate that water is polluted?

• carp, gar, and leeches

• insect larvae and nymphs

• sludge worms, anaerobic bacteria and fungi

• trout and other game fish

The BOD test is designed to directly measure

• how much light can pass to the bottom of the stream

• how rapidly the water is moving

• the amounts of nitrites in the water

• the rate at which oxygen is being consumed