Invasive vs Keystone species

A species that is NOT indigenous (native) to an area is called a/an: 

• native species
• natural species
• invasive species
• symbiotic species

A species that is indigenous to a given region or ecosystem naturally.

• native species
• accidental species
• introduced species
• local species

The particular role (job) of an organism in its environment including types of food it eats, how it obtains its food and how it interacts with other organisms is called a what?

• niche
• habitat
• home
• ecosystem

Most invasive species move out of their native ecosystem by:

• the exotic pet trade
• being transported by humans
• being planted in ornamental landscapes
• all of these are possible

The term biodiversity means:

• a wide variety of plants and animals in an ecosystem
• only a few types of plants and animals in an ecosystem
• an ecosystem composed mostly of plants
• an ecosystem composed mostly of animals

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An increase of biodiversity is normally a result of introducing an invasive species into an ecosystem.

• True
• False

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What does the graph tell you about biodiversity between 1600 and 1959?

• biodiversity has increased
• biodiversity has decreased
• biodiversity has remained about the same
• not enough information to tell

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Why do the populations of invasive species grow so quickly? 

• invasive species require more energy than other organisms
• invasive species are prey to many animals.
• invasive species have no natural predators.
• invasive species keep the ecosystems in equilibrium.

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How do invasive plants damage the environment?

• by competing with native species
• by changing plant communities
• by decreasing diversity
• all of these damage an ecosystem

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Which of the following is NOT a characteristic of Invasive plants?

• produces lots of seeds
• has effective seed dispersal methods
• easily establishes itself
• larger than any other plants