Oxygen SAG Curve

Question 1

what zone has the lowest amount of oxygen available to living organisms?

a. septic zone
b. recovery zone
c. clean zone
d. decomposition zone

Answer 1

A. Septic Zone

Question 2

You can determine the amount of oxygen in the water by the organisms that are found living in that water.

True or False

Answer 2

True

Question 3

which of the following is an indicator of oxygen rich water? choose 2
a. carp
b. sludge worm
c. perch
d. gar
e. trout

Answer 3

Perch and Trout

Question 4

which of the following are indicators of lower oxygen water? choose 2

a. bass
b. gar
c. perch
d. carp
e. trout

Answer 4

B. Gar
D. Carp

Question 5

which of the following statements are true? there is more than one for sure!

a. The different zones have different fish depending on the amount of oxygen available.
b. the recovery zone begins downstream from the point source.
c. Biological Oxygen Demand is highest in the clean zones.
d. the pollution flows both upstream and downstream from the point source.
e. no fish live in the septic zone.
f. clean zones can be found upstream from the point source of pollution and far downstream from the point source of pollution.
g. oxygen levels are steady from the decomposition zone through the recovery zone.

Answer 5

a. The different zones have different fish depending on the amount of oxygen available
b. the recovery zone begins downstream from the point source.
e. no fish live in the septic zone.
f. clean zones can be found upstream from the point source of pollution and far downstream from the point source of pollution.

Question 6

Put these in order
a. Septic Zone
b. Clean Zone 2
c. Clean Zone 1
d. Decomposition Zone
e. Recovery Zone

Answer 6

1. Clean Zone 1
2. Decomposition Zone
3. Septic Zone
4. Recovery Zone
5. Clean Zone 2

Question 7

BIOLOGICAL OXYGEN DEMAND refers to the oxygen needed by the fish to survive in water.

True or False

Answer 7

False

Question 8

Water Quality in PPM
1.Good
2. Slightly Polluted
3. Moderately Polluted
4. Highly Polluted
5. Gravely polluted

Answer 8

1. 8 - 9
2. 6.7 - 8
3. 4.5 - 6.7
4. 4 - 4.5
5. Below 4

Question 9

Clean Zone

Answer 9

High DO 8ppm
Low BOD

Question 10

Decomposition Zone

Answer 10

Highest BOD, Bacteria use all o2, slowly decreasing
Decreasing DO

Question 11

Septic Zone

Answer 11

Continued BOD decrease, higher than DO
Lowest Do
No fish

Question 12

Recovery Zone

Answer 12

Continued BOD Decrease, less BOD than DO
Increasing DO, more than BOD
Pollutant Tolerant Fish (Carp and Gar)

Question 13

Clean Zone 2

Answer 13

Increase/Peaking Do
Low BOD again
Normal Clean Water Organisms