WorksheetsScience 9 Unit C 2.0 Review
Total questions: 39
Worksheet time: 36mins
Assuming that winds typically come from the Southwest, what site would have the highest pollution?
Site A
Site B
Site C
Site D
Assuming that winds typically come from the Northwest, where would be the cleanest place to build a home?
Site A
Site B
Site C
Site D
Which of the following most likely caused a change in the air quality in country X over five days?
wind speed and direction
wind direction and amount of carbon dioxide
wind speed and temperature
temperature and amount of carbon dioxide
Scientific studies have shown that the mercury content in the northern pike (a fish) is extremely high in some Alberta lakes. The pike is the last link in a food chain. Based on the information given, the scientific study most likely had to do with…
Biomagnification
Phytoremediation
Biodegradation
Dispersion
Which organism shown in the food chain above would contain the greatest concentration of chemical pollutants?
phytoplankton
krill
tuna
shark
Fertilizer from agricultural run-off can enter nearby streams and lakes. One effect that this has on the water environment is that…
the water is poisoned
the oxygen content of the water drops
aquatic plant growth decreases
fish and other large animals increase in population
An abundance of which of the following would indicate that water is polluted?
trout and other game fish
sludge worms and leeches
salamanders and turtles
variety of insect larvae
Below is a chart of test results from water samples taken at various sites. Which of the following best describes the results from these sites?
Site 1 is unhealthy because of its dissolved oxygen levels are too high.
Site 3 and 4 are unhealthy because the temperature is too low.
Site 2 is unhealthy because the pH is too high and the temperature is too low.
Site 5 is unhealthy because the temperature is too high and the dissolved oxygen is too low.
At which of the four locations would you most likely see evidence of an algae bloom?
Location 1
Location 2
Location 3
Location 4
Which human activities are the main causes of acid rain?
A and B only
B and D only
C and D only
A and D only
Much of the power generated in Alberta comes from coal-fired plants. The burning of coal is the leading cause of…
Carbon dioxide pollution
Nitrogen dioxide pollution
Sulphur dioxide pollution
All of the above
Climate change has become an environmental issue. Which of the following chemicals is one of the greatest contributors to climate change?
DDT
CO2
CFC
O2
What human activity leads to acid rain?
burning fossil fuels
In the graph, the concentration of CFCs is reported in :
ppm (parts per million)
ppb (parts per billion
ppt (parts per trillion)
Years
Which year had the highest concentrations of CFCs in the atmosphere?
1990
1982
1998
1978
What is the concentration, in ppm, of lead in a 6 kg (6 000 000 mg) solution that contains 12 mg of lead?
1.0 ppm
2.0 ppm
3.0 ppm
4.0 ppm
LD50 is the standard used to compare the toxicity of any substance. LD50 means that…
50 animals would die if they consume a dose of the toxic substance
50% of the animals would die if they consume a dose of the toxic substance
50% of the test population of animals would die if they consume a specific dose of the toxic substance.
50% of the test population of animals would die if they consume any amount of the toxic substance
What is the concentration of a solution in parts per million if 0.02 grams of NaCl is dissolved in 1000 grams of water?
2 ppm
20 ppm
200 pm
0.2 ppm
What is the LD50?
20
23
30
35
Which of the following concentrations is higher?
0.2 ppm
2.2 ppm
20.2 ppm
200 ppm
What is more dangerous LD50 of?
0.04 ppm
1.29 ppm
1.04 ppm
0.40 ppm
Which of the following concentrations is higher?
2 ppm
2 ppb
2 ppt
Scrubbers are devices installed in smokestacks to
reduce the amount of materials such as SO2 in the smoke they discharge
clean out the stack so smoke can move rapidly upwards
reduce the amount of sulphur in coal before it is burned
clean out the boilers for more efficient operation
We can reduce our need for fossil fuels by developing
alternative energy sources
natural gas lines
gasoline powered cars
new oil sources
Select all the likely causes of algae blooms from the illustration
automobile exhaust
factory exhaust
pesticides
fertilizers
animal waste
Which is the smallest amount of a pollutant?
1 ppm (parts per million)
1 ppb (parts per billion)
1 ppt (parts per trillion)
1 part per thousand
Which is the highest concentration of lead?
5 ppm
0.5 ppm
5 ppb
0.5 ppb
Lethal dose (LD50) values are determined by the amount of a substance that:
kills at least 50 individuals of the test population exposed to the substance
kills a test population when given at least 50 ml of the substance
kills at least 50% of the test population exposed to the substance
kills a test population when given at least 50g of the substance
Which human activity is likely causing algae blooms in the river?
wind turbine farm
alpaca ranch
wastewater treatment plant
Bakerville
oil refinery
What effect is Bakerville having on the water quality in the river?
decreasing the water quality due to increased acidity
increased the water quality due to decreased pH
decreased water quality due to high dissolved oxygen
increased the water quality due to fish population
