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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
remove large amounts of carbon dioxide from the air
C
can modify their environment through technology
D
are able to increase the amount of finite resources available
2) Which action illustrates an increased understanding and concern by humans for ecological interrelationships?
A
importing organisms in order to stabilize existing ecosystems
B
implementing laws to regulate the number of animals hunted and killed each year
C
eliminating pollution standards for industries that promote technology
D
removing natural resources at a rate equal to the needs of the population
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
a technological fix
C
conservation
D
poor land use
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
increase of automobile traffic in the area around the plant
C
decrease of property values in the area around the plant
D
creation of new employment opportunities
5) Which human activity would have the most positive effect on the environment of an area?
A
using fire to eliminate most plants in the area
B
protecting native flowers and grasses in the area
C
introducing a foreign plant species to the area
D
clearing the area to eliminate weed species
6) Humans have altered ecosystems in many ways. The most positive impact on an ecosystem would result from
A
planting many different plants that are native to the area in a vacant lot
B
planting a single economically valuable crop in a 25-acre area
C
seeding an area with valuable plants that are from another ecosystem
D
filling in a swamp and planting grass and trees for a community park
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
provide more land for agricultural purposes
B
cause the extinction of undesirable animal species
C
maintain the diversity of the living environment
D
prevent these trees from reproducing too fast
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
throw the clippings into a stream or river to provide extra food for organisms living there
B
spray the clippings in the lawn with imported microbes that use them for food
C
burn the clippings and add the ashes to the soil
D
leave the clippings to decompose in the lawn to form materials that enrich the soil
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
increasing the diversity of life
B
the production of new species
C
the control of pathogens
D
recycling of nutrients
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
maintain the quality of the atmosphere
B
control the water cycle
C
control energy flow in natural ecosystems
D
recycle nutrients from one ecosystem to another
11) In order to reduce consumption of nonrenewable resources, humans could
A
use a natural-gas grill to barbecue instead of using charcoal
B
increase industrialization
C
heat household water with solar radiation
D
burn coal to heat houses instead of using oil
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 computers each year, with disposal of the old computers in landfills
C
development of new models of cars that travel fewer miles per gallon of gasoline
D
development of equipment to speed up the process of cutting down trees
13) One likely reason some experimental automobiles have been developed to use electricity rather than gasoline is that
A
the use of electricity will increase the manufacture of antipollution devices for cars
B
Earth has an unlimited supply of fossil fuels
C
gasoline is made from petroleum, a nonrenewable resource
D
the use of electricity will eliminate the need for all antipollution laws
14) Which concept is best represented in the diagram shown below?
A
Human population growth is the primary reason for equilibrium in ecosystems.
B
Equilibrium in ecosystems directly affects how humans modify ecosystems.
C
Equilibrium in ecosystems requires that humans modify ecosystems.
D
Human actions are a threat to equilibrium in ecosystems.
15) The negative effect humans have on the stability of the environment is most directly linked to an increase in
A
predation and disease
B
recycling activities by humans
C
supply of finite resources
D
human population size
16) Which human activity will most likely have a negative effect on global stability?
A
decreasing water pollution levels
B
decreasing habitat destruction
C
increasing recycling programs
D
increasing world population growth
17) Which of the following long-term changes could directly cause the other three?
A
increasing human population
B
scarcity of suitable animal habitats
C
depletion of resources
D
pollution of air and water
18) Which factor is primarily responsible for the destruction of the greatest number of habitats?
A
spread of predatory insects
B
decreased use of renewable resources
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
Global warming will decrease as a result of a lower demand for fossil fuels.
B
All environmental problems can be solved without a reduction in the growth rate of the human population.
C
Future ecosystems will be stressed and many animal habitats may be destroyed.
D
One hundred years after all resources are used up, the human population will level off.
20) Continued depletion of the ozone layer will most likely result in
A
a decrease in climatic changes
B
an increase in marine ecosystem stability
C
an increase in skin cancer among humans
D
a decrease in atmospheric pollutants
*select an answer for all questions
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