Human Impact Biology

What long-term impact could the destruction of large areas of forests have on Earth?

• decreased rates of erosion
• increased atmospheric carbon dioxide levels
• decreased amounts of acid rain
• increased atmospheric oxygen levels

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Why is it important to conserve the biodiversity of Earth?

• to decrease the amount of global predator populations
• to decrease the stability of major global ocean currents
• to increase the stability of ecosystems during environmental changes
• to increase the amount of nonrenewable resources located in the lithosphere

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The number one threat to biodiversity

• pollution
• fragmentation
• habitat destruction
• limiting factors

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How can people reduce the amount of resources they use?

• make more landfills and garbage dumps
• buy products with lots of packaging 
• use water, electricity, and gas conservatively and recycle metal, paper, and glass
• Think only about what you need right now and don’t worry about the future

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Which is a main cause of soil erosion?

• strong winds
• flash floods
• human activity
• fossil fuels

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Which organism would have the greatest concentration of pollution?

• zooplankton
• large fish
• fish-eating birds of prey
• small fish

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Insecticides are sprayed over a large area in an effort to reduce the number of grasshoppers that are eating the corn plants. How will this change affect this food chain? 

• The number of grasshoppers will increase
• The number of lizards will increase
• The number of lizards and hawks will decrease
• The number of grasshoppers, lizards, and hawks will decrease

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All of the following are examples of environmental changes that can be caused by humans except - 

• clearing land for housing developments
• pesticides
• volcanic eruption
• pollution

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New fuels are being produced by converting corn and grasses into compounds containing alcohols that can be broken down for energy in various engines. The purpose of this research is to:

• Reduce the use of nonrenewable resources.
• Increase the rate of air pollution.
• Reduce the rate of homeostasis in organisms.
• Cause a loss of biodiversity in the rain forests.

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The northern elephant seal was almost hunted to extinction in the 1800s. By the late 1890's approximately one-hundred seals were left, reducing the gene pool of the population. What will be the consequence of this reduction?

• Competition within the population will increase.
• The surviving elephant seals will be better able to adapt.
• Inbreeding will be less frequent among the remaining population.
• Elephant seals will be more vulnerable to changes.

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