Invasive Species

What is an invasive species?

• A native (naturally found) species which are added to an area. 

• A non-native (not naturally found) species added to an area. 

• A keystone species in an environment

• none of the above

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Invasive species alter the ecosystem by a___________in number quickly,this leads to _____ food for the native  species. 

• increasing  less

• decline  decreasing

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Invasive species grow quickly due to the lack of predators, this leads to a decline or extinction of the native population. True or false? 

• false

• true

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A species that is not native to an area is called: 

• Native Species

• Natural Species

• Invasive Species

• Symbiotic Species

What factors may lead a nonnative species to become invasive? Select all that apply.

• they lack predators

• they can eat a variety of foods

• they are generalists

• they mature and reproduce quickly

Kudzu has overgrown many parts of southern Missouri and native ground plants have disappeared from the area. This is an example of:

• Parasitism between kudzu and the native plants

• A predator prey relationship between ground plants and kudzu

• Competition occurring between the native and invasive species

• Commesalism occurring between the kudzo and native plants

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A species that does not belong in a balanced ecosystem, comes in, and changes it (usually for the worse).

• flagnship

• umbrella

• invasive

• predator

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What is an invasive species?

• an organism that is added to an environment to make it better

• an organism that dies because it can't survive in its new environment

• an introduced organism that harms its new environment because it isn't native

• an organism whose population is under control

Answer explanation

Invasive species have no natural predators so they hurt any ecosystem they are added to. They cause the native species to die off.

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Zebra mussels and kudzu vine are both invasive species brought to America. Why do invasive species thrive in their new habitat?

• The invasive species are always autotrophs.

• The new habitat is free of pollution.

• The invasive species are weaker.

• The new habitat often lacks natural predators of the invasive species.

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When taken to a new habitat, non-native plants often threaten native plants of the new habitat.  Why do they do this?

• Non-native plants are able to mutate rapidly

• Non-native  plants cause native animals to relocate

• Non-native plants are able to be used for medicine

• Non-native plants compete with native plants for resources

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