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Water Quality And Water On Earth
Test Description: Review for water quality and water on earth.
Instructions: Answer all questions to get your test result.
1) Water makes up what fraction of the human body?
A
4/5
B
1/2
C
2/3
D
1/3
2) The place where an organism lives and that provides the things it needs to survive is its
A
environment
B
habitat
C
home
D
ecosystem
3) What percent of the water on Earth is salt water?
A
70%
B
50%
C
25%
D
97%
4) What percent of the water on Earth is freshwater?
A
3%
B
33%
C
75%
D
25%
5) Where is most of the freshwater on Earth located?
A
Frozen in glaciers and at the poles
B
In rivers
C
Underground
D
In lakes
6) Which ocean is the largest?
A
Pacific
B
Artic
C
Indian
D
Atlantic
7) Which below is not a way that dissolved oxygen can get into a water system.
A
By diffusion from the surrounding air
B
By aeration of water that has tumbled over falls and rapids.
C
By plants during photosynthesis
D
By decomposition of organic matter by bacteria.
8) The oxygen found in the water molecule (H20) is the oxygen that fish can use to breathe.
A
True
B
False
9) What can happen if the dissolved oxygen level drop below normal levels?
A
Fish will begin to die
B
The water will turn blue
C
Fish will overpopulate
D
Plants can die.
10) Which contains the most dissolved oxygen?
A
Hot, running water
B
Cold, stagnant water
C
Hot, stagnant water
D
Cold, running water
11) What is the measure of the acidic or basic level of a water system?
A
pH
B
Eutrophicaton
C
Turbidity
D
Dissolved oxygen
12) What is neutral pH?
A
0
B
5
C
10
D
7
13) What is the most likely source of phosphates and nitrates?
A
Fertilizers and pollution
B
Waste and warm water discharge
C
Fertilizers and effluents dumped into a stream
D
Sewage and fertilizers
14) What can an excess amount of phosphates and nitrates do to an aquatic ecosystem?
A
Increase the dissolved oxygen level which would increase the number of fish
B
Would not affect the water system.
C
Increase the amount of algae would would eventually decrease the dissolved oxygen levels
D
Decrease the amount of algae which would decrease the number of fish
15) Which factor below will not affect the temperature of an aquatic ecosystem.
A
The depth of the water
B
The time of the year
C
The pH
D
The amount of shade received from shoreline vegetation
16) What is the measure of the amount of suspended material found in a water system?
A
Dissolved oxygen
B
pH
C
Turbidity
D
Bioindicators
17) What instrument is used to measure turbidity?
A
Secchi disk
B
Barometer
C
Hydrometer
D
Thermometer
18) What is one way to decrease the turbidity in a stream?
A
Remove all of the trees and shrubs on the banks of the stream
B
Plant trees and shrubs on the banks of the stream
C
Cut deep channels into the banks on the side of the stream
D
Build a dam on the stream to slow the flow of water
19) A species which is used to indicate the health of an environment or ecosystem.
A
Bioindicators
B
Health indicator
C
Aquatic barometers
D
Species indicators
20) Over the last million years, what has happened to the total amount of water on earth?
A
decreased
B
increased
C
risen and fallen
D
remained about the same
*select an answer for all questions
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