Unit Test

Question 1

Which of the following is true concerning hull fouling from commercial shipping and recreational boating?a.It constitutes less than half of all nonnative species introductions.b.The revenue brought in from these industries is relatively small.c.It is difficult to prevent since ship hulls begin, conduct, and end voyages in water.d.It is best combated by chemical treatments.

Revolt · Accepted Answer

C: C

Question 2

The negative impacts of nonnative species generally outweigh the positive impacts.

Revolt · Accepted Answer

A: T

Question 3

Why might it be beneficial to regulate what species of plants and animals people are allowed to own in particular environments?a.Some species might become invasive and destructive if they escaped.b.Some species may be dangerous to humans.c.Nonnative plants and animals should only be used for commercial purposes.d.There is no reason to restrict an individuals’ right to own plants or animals.

Revolt · Accepted Answer

A: A

Question 4

Since invasive species did not co-evolve with the other species in the ecosystem where they were introduced _______.a.they can unbalance the ecosystemb.they are considered a serious environmental problemc.they lack natural predators to help control their populationd.all of the above

Revolt · Accepted Answer

D: D

Question 5

Nonnative species disrupt ecosystems by _______.a.increasing biodiversityb.preventing the spread of diseasec.disrupting food chainsd.increasing the populations of native species

Revolt · Accepted Answer

C: C

Question 6

Why might it be beneficial for governments to restrict the types of plants and animals that individuals can keep as pets in a particular environment?

Revolt · Accepted Answer

For many exotic pet species, if they escape or are released into the environment they have the potential to become invasive and do extensive damage to the local environment. In order to preserve the local environment for everyone, it may therefore be beneficial to restrict individuals’ rights to own exotic species.

Question 7

Which of the following is not a reason that nonnative species are reared outside their native ecosystems?a.They are commercially important.b.They are used to replace native species.c.They are used for restocking programs.d.None of the above

Revolt · Accepted Answer

D: D

Question 8

Which of the following is an example of chemical control of nonnative species?a.mowingb.herbicidesc.net barriersd.inspections

Revolt · Accepted Answer

B: B

Question 9

Explain why the cane toad was a failure as a biological control method in Australia.

Revolt · Accepted Answer

The cane toad was introduced into Australia to control the population of sugarcane beetles. However, upon introduction, the toads did not eat the beetle, but instead began damaging local ecosystems by preying upon other organisms and poisoning most animals that tried to prey on them.

Question 10

What factor determines when a species is considered invasive?a.It has positive environmental impacts.b.It is environmentally damaging.c.It spreads outside its native range.d.It spreads within its natural range.

Revolt · Accepted Answer

B: B

Unit Test Answers

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