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WorksheetsHydrosphere: Freshwater
Total questions: 17
Worksheet time: 1hrs 25mins
Name
Class
Date
1.
If excessive amounts of hot water are discharged into a lake, the immediate result will most likely be...
a)
an increase in sewage content
b)
a decrease in the amount of dissolved oxygen in the lake
c)
an increase of mercury in the lake
d)
a decrease in nitrates
2.
Discharge entering a stream at a specific, detectable point such as a pipe or outfall.
a)
Point source pollution
b)
Non-point source pollution
c)
Fog
d)
Riparian
3.
Diffuse runoff from large areas of land.
a)
Point source pollution
b)
Nonpoint source pollution
c)
Sediment
d)
Watershed
4.
Rapid, dense growth of algae that robs the water of oxygen as it dies and decomposes.
a)
Algal bloom
b)
Sediment
c)
Point source pollution
d)
Non-point source pollution
5.
Which of the following is NOT part of your ecological address?
a)
River basins
b)
Biodiversity
c)
Energy
d)
Metabolism
6.
The totality of genes, species and ecosystems in a region
a)
Biodiversity
b)
Greenway
c)
Carrote=s
d)
Macroinvertebrate
7.
All of the following are reasons why macroinvertebrates are commonly used as bioindicators EXCEPT
a)
Many species are sensitive to pollutants and environmental stress
b)
They are easily collected.
c)
Unlike birds and mammals, they cannot easily escape aquatic sources of stress.
d)
Most species are primary producers and generate dissolved oxygen.
8.
Thermal pollution can result when...
a)
DO levels decrease
b)
A factory dumps cooling water directly into a lake
c)
Nitrate levels peak
d)
Turbidity decreases
9.
What effect can increased turbidity have on water temperature?
a)
Decreases temperature by blocking light.
b)
Decreases temperature by stimulating algal growth.
c)
Increases temperature when the particles absorb sunlight
d)
There is no relationship between turbidity and temperature.
10.
What is turbidity a measure of?
a)
Photosynthesis in water.
b)
Change in biological activity.
c)
Cloudiness of water.
d)
Solubility of atmospheric gases in water.
11.
Which of the following can directly increase water turbidity?
a)
Decreased temperature and sewage dumping
b)
Algae growth and increased pH.
c)
Increased soil erosion and algae growth.
d)
Fertilizer runoff and increased DO.
12.
What is the most immediate effect of nitrate of phosphate pollution?
a)
Increased algae growth
b)
Greater macroinvertebrate diversity
c)
A decrease in decomposer activity.
d)
Decreased turbidity.
13.
How do benthic macroinvertebrates indicate water quality?
a)
If pollution-intolerant organisms are found, quality is good.
b)
If pollution-intolerant organisms not found, water is poor.
c)
If pollution-tolerant organisms are found, quality is good.
d)
If any of these are found, water is of poor quality.
14.
Cooler water temperatures are better because
a)
Cold water holds more dissolved oxygen
b)
Cold water makes it harder for bacteria to grow
c)
Both are reasons why cool water is beneficial
15.
If water has e.coli, fecal coliform bacteria, and/or cryptosporidium in it
a)
its ok to drink the water as long as the levels are low
b)
its totally fine to drink the water
c)
the water is not drinkable since these microorganisms make you really sick
d)
you should give the water to kids
16.
Macroinvertebrates such as stoneflies, mayflies and water boatmen require high levels of dissolved oxygen and their abundance is an indication of:
a)
Poor water quality
b)
Good water quality
c)
Don't tell us anything about water quality
d)
Invertibrates don't tell us anything about water quality
17.
What metals are potentially toxic to humans and aquatic life?
a)
lead and mercury and chromium
b)
hydrogen, titanium and gold
c)
silver, cobalt and manganese
d)
zinc, scandium and platinum
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