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Ecology 2: Human Impact On Ecosystems
Test Description: Use your knowledge of Living Environment to answer all questions in the data set. You may need a calculator to answer some of the questions. Good Luck.
Instructions: Answer all questions to get your test result.
1) A major reason that humans can have such a significant impact on an ecological community is that humans
A
reproduce faster than most other species
B
can modify their environment through technology
C
are able to increase the amount of finite resources available
D
remove large amounts of carbon dioxide from the air
2) Which action illustrates an increased understanding and concern by humans for ecological interrelationships?
A
eliminating pollution standards for industries that promote technology
B
removing natural resources at a rate equal to the needs of the population
C
importing organisms in order to stabilize existing ecosystems
D
implementing laws to regulate the number of animals hunted and killed each year
3) Farming reduces the natural biodiversity of an area, yet farms are necessary to feed the world's human population. This situation is an example of
A
a trade-off
B
conservation
C
poor land use
D
a technological fix
Helpful Hint
A new automobile manufacturing plant is opening in a certain town. It will have some negative environmental impacts. This is a trade-off that the town officials had to consider carefully before giving final approval.
4) They most likely gave their approval because the negative impacts would be offset by the
A
release of pollutants into the environment
B
creation of new employment opportunities
C
decrease of property values in the area around the plant
D
increase of automobile traffic in the area around the plant
5) Which human activity would have the most positive effect on the environment of an area?
A
introducing a foreign plant species to the area
B
clearing the area to eliminate weed species
C
protecting native flowers and grasses in the area
D
using fire to eliminate most plants in the area
6) Humans have altered ecosystems in many ways. The most positive impact on an ecosystem would result from
A
seeding an area with valuable plants that are from another ecosystem
B
planting many different plants that are native to the area in a vacant lot
C
filling in a swamp and planting grass and trees for a community park
D
planting a single economically valuable crop in a 25-acre area
7) Some organizations are buying up sections of forest land. Once purchased, these sections of forest will never be cut down. The main reason for protecting these sections of forest is to
A
maintain the diversity of the living environment
B
prevent these trees from reproducing too fast
C
provide more land for agricultural purposes
D
cause the extinction of undesirable animal species
8) Some homeowners mow their lawns during the summer, collect the grass clippings and dispose of them in a landfill. Instead of taking the clippings to a landfill, a more ecologically sound procedure would be to
A
spray the clippings in the lawn with imported microbes that use them for food
B
leave the clippings to decompose in the lawn to form materials that enrich the soil
C
burn the clippings and add the ashes to the soil
D
throw the clippings into a stream or river to provide extra food for organisms living there
9) Many homeowners who used to collect, bag, and discard grass clippings are now using mulching lawnmowers, which cut up the clippings into very fine pieces and deposit them on the soil. The use of mulching lawnmowers contributes most directly to
A
the control of pathogens
B
the production of new species
C
recycling of nutrients
D
increasing the diversity of life
10) In most states, automobiles must be inspected every year to make sure that the exhaust fumes they emit do not contain high levels of pollutants, such as carbon monoxide. This process is a way humans attempt to
A
control energy flow in natural ecosystems
B
control the water cycle
C
recycle nutrients from one ecosystem to another
D
maintain the quality of the atmosphere
11) In order to reduce consumption of nonrenewable resources, humans could
A
burn coal to heat houses instead of using oil
B
use a natural-gas grill to barbecue instead of using charcoal
C
increase industrialization
D
heat household water with solar radiation
12) Which of the following results of technological advancement has a positive effect on the environment?
A
development of equipment that uses solar energy to charge batteries
B
development of new models of cars that travel fewer miles per gallon of gasoline
C
development of equipment to speed up the process of cutting down trees
D
development of new models of computers each year, with disposal of the old computers in landfills
13) One likely reason some experimental automobiles have been developed to use electricity rather than gasoline is that
A
the use of electricity will eliminate the need for all antipollution laws
B
gasoline is made from petroleum, a nonrenewable resource
C
the use of electricity will increase the manufacture of antipollution devices for cars
D
Earth has an unlimited supply of fossil fuels
14) Which concept is best represented in the diagram shown below?
A
Human population growth is the primary reason for equilibrium in ecosystems.
B
Human actions are a threat to equilibrium in ecosystems.
C
Equilibrium in ecosystems directly affects how humans modify ecosystems.
D
Equilibrium in ecosystems requires that humans modify ecosystems.
15) The negative effect humans have on the stability of the environment is most directly linked to an increase in
A
recycling activities by humans
B
supply of finite resources
C
predation and disease
D
human population size
16) Which human activity will most likely have a negative effect on global stability?
A
decreasing water pollution levels
B
increasing world population growth
C
decreasing habitat destruction
D
increasing recycling programs
17) Which of the following long-term changes could directly cause the other three?
A
scarcity of suitable animal habitats
B
depletion of resources
C
increasing human population
D
pollution of air and water
18) Which factor is primarily responsible for the destruction of the greatest number of habitats?
A
decreased use of renewable resources
B
spread of predatory insects
C
human population growth
D
epidemic diseases
Helpful Hint
The graph below shows how the human population has grown over the last several thousand years.
19) Which statement is a valid inference that can be made if the human population continues to grow at a rate similar to the rate shown between 1000 A.D. and 2000 A.D.?
A
One hundred years after all resources are used up, the human population will level off.
B
Future ecosystems will be stressed and many animal habitats may be destroyed.
C
All environmental problems can be solved without a reduction in the growth rate of the human population.
D
Global warming will decrease as a result of a lower demand for fossil fuels.
20) Continued depletion of the ozone layer will most likely result in
A
an increase in skin cancer among humans
B
a decrease in atmospheric pollutants
C
a decrease in climatic changes
D
an increase in marine ecosystem stability
*select an answer for all questions
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