Biodiversity and Sustainability

Biodiversity refers to

• extinct species
• the variety of species on Earth
• nonrenewable resources
• the rate of species decline

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Sustainability refers to

• how many species are present in an ecosystem
• when a species goes extinct
• how long a species lives
• the ability to maintain ecological process over long periods of time.

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The higher the biodiversity, the more sustainable an ecosystem is.

• True
• False

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A drought has hit this grassland biome. How will this effect the rabbit population?

• The rabbits will increase in number.
• The rabbit population will stay the same.
• The rabbit population will decrease.
• The rabbit population will become extinct immediately.

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Brown trout consume (eat) more tadpoles when the fly larvae reduce in number (decrease).  This proves...

• The dependence of organisms and biodiversity in an ecosystem
• Diversity increases as organisms decrease
• Losing an animal is good for ecosystems
• Changes in ecosystems create new organisms

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In a grassland ecosystem, lions prey on wildebeest. The population of lions has declined steadily because of illegal hunting. What will most likely happen to the population of wildebeest?

• The wildebeest population will increase
• The wildebeest population will decrease
• The wildebeest population will remian the same

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In this tundra food web, if grasses were removed what would happen to the sustainability of the ecosystem?

• There would be an overpopulation of arctic hares and lemmings.
• Polar bears would move to a new ecosystem
• The ecosystem would collapse because it lost its main producer
• Wildflowers would die out from the ecosystem

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Which of the following statements about biodiversity is TRUE? (7.10B)

• More biodiversity →Less chance for an ecosystem to sustain itself

• More biodiversity →Better chance for an ecosystem to sustain itself

• More biodiversity →Less species in an ecosystem

• More biodiversity →More pollution in an ecosystem

A scientist observed three very different ecosystems. Her observations are recorded in the table. Which ecosystem would be best able to sustain itself? (7.10B)

• Ecosystem “B” has too many different species to sustain itself.

• Ecosystem “C” has the best chance of sustaining itself because it has few species.

• Ecosystem “B” has the best chance of protecting itself from outside stress, compared to Ecosystem “A” and Ecosystem “C”.

• Ecosystem “A” has the best chance of protecting itself from outside stress, compared to Ecosystems “B” and Ecosystem “C”.

Biodiversity contributes to the sustainability of an ecosystem because — (7.10B)

• all the organisms in the ecosystem have genetic material

• there is an increased chance for organisms to survive changes

• organisms are allowed to respond to internal and external stimuli

• the flow of energy in an ecosystem remains constant