Ecology and Human Impact Review

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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What is this picture describing?

• It is describing natural selection.

• It is describing direct competition between flamingos and ducks.

• It is describing abiotic factors of the tundra.

• It is describing the niche of each bird.

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The northern elephant seal was almost hunted to extinction in the 1800s. By the late 1890s, 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.

• The elephant seals will be more vulnerable to environmental change. 

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In this photo, what is an abiotic factor?

• Deer

• Grass

• rain

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How do you think this food web would be affected if the plants were eliminated?

• Only the fungi would survive.

• Birds and nematodes would thrive.

• The food web would completely collapse.

• The food web would produce more bacteria to compensate.

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In 1859, two dozen rabbits were introduced to Australia. By 1953, there were an estimated one billion rabbits in Australia. The addition of the rabbits to this established ecosystem caused many problems, including a huge decrease in native plants. This left little food for native animals. This is an example of how

• diversity improves an established ecosystem.

• genetic variation leads to the formation of a new species.

• the introduction of non-native species upsets a balanced system.

• changing in one part of a system does not affect other parts of the system.

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In this food chain, how many types of primary consumers (herbivores) are included?

• 0

• 1

• 2

• 3

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Populations of organisms that are introduced into a new habitat and reproduce very rapidly are known as _____________ species.

• endemic

• predatory

• invasive

• parasitic

All energy in any ecosystem starts as

• carbohydrates.

• electricity.

• sunlight.

• water.

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Which of these organisms is a part of the group that produces all of the available energy in a food web?

• Fly

• Grass

• Mouse

• Sun

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