Lesson 12.5 & 12.6 Human Impact Review

Which situation has had the most negative effect on the ecosystems of Earth?

• use of air pollution controls

• use of natural predators to control insect pests

• recycling glass, plastic, and metals

• increasing human population

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Increased production of goods makes our lives more comfortable, but causes an increase in the demand for energy and other resources. One negative impact of this situation on ecosystems is an increase in

• living space for wildlife

• renewable resources

• the diversity of plant species

• pollution levels in the atmosphere

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Which human activity would most likely deplete finite resources?

• use of natural enemies to eliminate insect pests

• development of wildlife refuges

• governmental restriction of industrial pollution

• uncontrolled population growth

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One irreversible effect of both deforestation and water pollution on the environment is the

• extinction of species

• thinning of the ozone shield

• depletion of atmospheric carbon dioxide levels

• increase in renewable resources

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A change in the acidity of mountain lakes would most likely be a result of

• ecological succession of the area at the top of the mountain

• the introduction of new species into the lakes

• air pollution from smoke stacks miles away

• planting grasses and shrubs around the lakes

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Continued depletion of the ozone layer will most likely result in

• an increase in skin cancer among humans

• a decrease in atmospheric pollutants

• an increase in marine ecosystem stability

• a decrease in climatic changes

An example of recycling is

• using a paper cup instead of a mug

• turning off the lights when leaving a room

• using plastic from a soda bottle to make a certain type of clothing

• using two paper towels rather than five to clean up a spill

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Which method of protecting members of an endangered species is most ecologically sound?

• protecting the habitats where these animals live from human development

• capturing these animals and putting them in wildlife parks

• feeding and constructing shelters for these organisms

• passing laws that encourage hunting of the predators of these species

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Many farmers plant corn, and then harvest the entire plant at the end of the growing season. One negative effect of this action is that

• soil minerals used by corn plants are not recycled

• corn plants remove acidic compounds from the air all season long

• corn plants may replace renewable sources of energy

• large quantities of water are produced by corn plants

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The importation of organisms such as the Japanese beetle and gypsy moth to areas where they have no natural enemies best illustrates

• the use of abiotic factors to reduce pest species

• the selection of species to mate with each other to produce a new variety

• attempts by humans to protect extinct species

• a human activity that disrupts existing ecosystems

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