Ecology - Human Impact

In lakes that are exposed to acid rain, fish populations are declining. This is primarily due to changes in which lake condition?

• A) size
• B) temperature
• C) pH
• D) location

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

• A) ecological succession of the area at the top of the mountain
• B) the introduction of new species into the lakes
• C) air pollution from smoke stacks miles away
• D) planting grasses and shrubs around the lakes

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Many homeowners and businesses are installing solar electric systems. Greater use of solar electric systems benefits the environment because it

• A) depends on the greater use of fossil fuels
• B) conserves nonrenewable resources
• C) produces gases that cause global warming
• D) reduces the need for the ozone shield

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Some time ago, there were thousands of California condors in North America. Large numbers were poisoned from lead in bullets that were used to kill the animals the condors fed on. An effort was made to help save this large scavenger. There are now more than 350 California condors in North America. The condors most likely increased in number because humans decided to

• A) produce lead-resistant condors through asexual reproduction
• B) pass laws against using lead bullets to kill animals used by condors for food
• C) introduce plants that didn't absorb the lead from discharged bullets
• D) produce lead-resistant prey for the condors through genetic engineering

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Nonrenewable resources are

• A) not finite and are not depleted over time
• B) not finite and are depleted over time
• C) finite and are not depleted over time
• D) finite and are depleted over time

People living in and around the Amazon rain forest have used parts of the gaviola tree to prepare medicines. Research is being conducted to determine if this tree can provide cures for many types of cancer. Continued destruction of rain forests might

• A) reduce biodiversity and remove organisms with the potential to help humans
• B) increase biodiversity and remove damaged and diseased trees
• C) reduce biodiversity and increase the reproductive rates of all organisms
• D) increase biodiversity and ecosystem stability where humans plant crops

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The overuse of chemical fertilizers has resulted in the growth of some lawns in which decomposers cannot live. This would interfere most directly with the ability of the lawn ecosystem to

• A) recycle energy
• B) recycle nutrients
• C) maintain atmospheric pH
• D) reduce biodiversity

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Which environmental change would cause the greatest reduction in the biodiversity of a large ecosystem?

• A) building a new home
• B) building a new store in a shopping mall
• C) widespread use of pesticides
• D) widespread recycling prograrns

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The graph shows the number of species that have become extinct since 1800. It also shows the change in the size of the human population for the same period of time. The graph indicates that the number of species that have become extinct

• A) has increased with increasing human population

• B) has decreased with increasing human population

• C) is not affected by the size of the human population

• D) is greater than the size of the human population

A human activity that could significantly decrease the amount of carbon dioxide in the air is

• A) increasing the use of fossil fuel
• B) controlling insect pests that eat stored grain
• C) burning garbage and trash to generate electricity
• D) preserving and expanding forest habitats that shelter wildlife

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