Ecology 2: Human Impact On Ecosystems Question Preview (ID: 56904)

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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) are able to increase the amount of finite resources available

c) can modify their environment through technology

d) remove large amounts of carbon dioxide from the air

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) implementing laws to regulate the number of animals hunted and killed each year

d) importing organisms in order to stabilize existing ecosystems

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) poor land use

b) a trade-off

c) conservation

d) a technological fix

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

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

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

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) cause the extinction of undesirable animal species

b) prevent these trees from reproducing too fast

c) maintain the diversity of the living environment

d) provide more land for agricultural purposes

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) 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) spray the clippings in the lawn with imported microbes that use them for food

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

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 energy flow in natural ecosystems

c) control the water cycle

d) recycle nutrients from one ecosystem to another

In order to reduce consumption of nonrenewable resources, humans could

a) burn coal to heat houses instead of using oil

b) increase industrialization

c) heat household water with solar radiation

d) use a natural-gas grill to barbecue instead of using charcoal

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 new models of computers each year, with disposal of the old computers in landfills

d) development of equipment to speed up the process of cutting down trees

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) Earth has an unlimited supply of fossil fuels

d) the use of electricity will increase the manufacture of antipollution devices for cars

Which concept is best represented in the diagram shown below?

a) Human actions are a threat to equilibrium in ecosystems.

b) Equilibrium in ecosystems requires that humans modify ecosystems.

c) Equilibrium in ecosystems directly affects how humans modify ecosystems.

d) Human population growth is the primary reason for equilibrium in ecosystems.

The negative effect humans have on the stability of the environment is most directly linked to an increase in

a) supply of finite resources

b) human population size

c) predation and disease

d) recycling activities by humans

Which human activity will most likely have a negative effect on global stability?

a) increasing world population growth

b) increasing recycling programs

c) decreasing habitat destruction

d) decreasing water pollution levels

Which of the following long-term changes could directly cause the other three?

a) pollution of air and water

b) scarcity of suitable animal habitats

c) depletion of resources

d) increasing human population

Which factor is primarily responsible for the destruction of the greatest number of habitats?

a) decreased use of renewable resources

b) epidemic diseases

c) human population growth

d) spread of predatory insects

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) Future ecosystems will be stressed and many animal habitats may be destroyed.

b) Global warming will decrease as a result of a lower demand for fossil fuels.

c) All environmental problems can be solved without a reduction in the growth rate of the human population.

d) One hundred years after all resources are used up, the human population will level off.

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) a decrease in atmospheric pollutants

d) an increase in skin cancer among humans

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