Organisms Invade

Question 1

1. If a species has become extirpated it has:
   A. Migrated to its normal wintering area
   B. Become globally extinct
   C. Become locally extinct
   D. Been temporarily displaced from its habitat

Answer 1

C. Become locally extinct

Question 2

2. Which of the following is not a threat to biodiversity?
   A. Seasonal changes
   B. Habitat loss
   C. Global change
   D. Overharvesting

Answer 2

A. Seasonal changes

Question 3

3. What makes a species good at invading?
   A. High reproduction rate
   B. Ecological competence
   C. Phenotypic plasticity
   D. All the above

Answer 3

D. All the above

Question 4

4. What is the native region of the zebra mussel?
   A. North sea
   B. Caspian and Black Seas
   C. Pacific ocean
   D. Yangtze river

Answer 4

B. Caspian and Black Seas

Question 5

5. Why is the zebra mussel problematic?
   A. They can remove all the plankton from the food web
   B. They change the substrate in fish spawning areas
   C. They can outcompete native mussels for resources
   D. All the above

Answer 5

D. All the above

Question 6

________ _________ are those that humans move from native locations to new geographic regions

Answer 6

Introduced Species