7.10b

Biodiversity refers to

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

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.

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

• True
• False

Which best explains why producers are at the beginning of all food chains?

• They turn dead animals into nutrients
• They provide shelter for smaller animals
• The transfer energy from the sun into food

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.

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

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

Field mice eat corn. Which would most likely happen if the field mouse population grew?

• There would be more corn to feed the field mice.
• There would be less corn due to the mice eating it.
• The habitat would get overpopulated because the mice woudl eat too much.

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

Humans are not affected by the biodiversity of ecosystems.

• True
• False